The Human Eye and the Colourful World MCQ Quiz

Q: What is the function of the eye lens?

The eye lens forms an inverted real image on the retina and adjusts its focal length to focus on objects at different distances.

Q: What is the power of accommodation?

The ability of the eye lens to adjust its focal length is called accommodation.

Q: What is the least distance of distinct vision?

The least distance of distinct vision is the minimum distance at which objects can be seen most distinctly without strain. It is also called the near point of the eye.

Q: What are the common defects of vision and how are they corrected?

The common defects of vision are myopia, hypermetropia, and presbyopia. Myopia is corrected using a concave lens, hypermetropia is corrected using a convex lens, and presbyopia is corrected using bifocal lenses

Q: What is the difference between myopia and hypermetropia?

Myopia, or near-sightedness, is when a person can see nearby objects clearly but cannot see distant objects distinctly. Hypermetropia, or far-sightedness, is when a person can see distant objects clearly but cannot see nearby objects distinctly

Question 1

Question 1: Which part of the human eye is responsible for allowing light to enter?

A. RetinaB. CorneaC. IrisD. Pupil

Answer

B. Cornea. It is the transparent outer layer that forms the front of the eye.

Question 2

Question 2: What is the primary function of the iris in the human eye?

A. To focus light on the retinaB. To control the size of the pupilC. To convert light into electrical signalsD. To protect the eye from injury

Answer

B. To control the size of the pupil. The iris is a muscle that adjusts the size of the pupil to regulate the amount of light entering the eye.

Question 3

Question 3: Which part of the eye is responsible for converting light into electrical signals?

A. CorneaB. LensC. RetinaD. Optic nerve

Answer

C. Retina. It contains light-sensitive cells that generate electrical signals when illuminated.

Question 4

Question 4: What is the approximate diameter of the human eyeball?

A. 1.3 cmB. 2.3 cmC. 3.3 cmD. 4.3 cm

Answer

B. 2.3 cm.

Question 5

Question 5: Where does the majority of the refraction of light occur in the human eye?

A. CorneaB. LensC. RetinaD. Vitreous humor

Answer

A. Cornea. The cornea is responsible for most of the light bending, while the lens fine-tunes the focus.

Question 6

Question 6: What is the function of the optic nerve in the human eye?

A. To convert light into electrical signalsB. To control the size of the pupilC. To transmit electrical signals to the brainD. To focus light on the retina

Answer

C. To transmit electrical signals to the brain. The optic nerve carries the signals from the retina to the brain for processing.

Question 7

Question 7: Which part of the eye acts as a light-sensitive screen?

A. CorneaB. PupilC. IrisD. Retina

Answer

D. Retina. It acts like a screen where the image is formed.

Question 8

Question 8: What is the term for the ability of the eye to adjust its focus on objects at different distances?

A. RefractionB. AccommodationC. DispersionD. Astigmatism

Answer

B. Accommodation. It refers to the eye’s ability to change its focal length.

Question 9

Question 9: Which part of the eye plays a crucial role in the process of accommodation?

A. IrisB. PupilC. Ciliary musclesD. Optic nerve

Answer

C. Ciliary muscles. These muscles control the shape of the lens, allowing for focus adjustment.

Question 10

Question 10: What happens to the lens when the ciliary muscles contract?

A. The lens becomes thinner, increasing its focal lengthB. The lens becomes thicker, decreasing its focal lengthC. The lens moves forward, focusing on nearby objectsD. The lens moves backward, focusing on distant objects

Answer

B. The lens becomes thicker, decreasing its focal length. This allows for clear vision of nearby objects.

Question 11

Question 11: What is the near point of the eye?

A. The farthest point the eye can see clearlyB. The point at which the eye is most relaxedC. The minimum distance for clear vision without strainD. The point where light is focused on the retina

Answer

C. The minimum distance for clear vision without strain.

Question 12

Question 12: What is the typical near point for a young adult with normal vision?

A. 10 cmB. 25 cmC. 50 cmD. 100 cm

Answer

B. The farthest point the eye can see clearly.

Answer

D. Infinity.

Answer

C. Cataract. It is a clouding of the lens that can lead to vision loss.

Answer

C. Through cataract surgery.

Answer

B. It increases.

Answer

A. Inverted and real.

Answer

D. Glaucoma.

Answer

C. Myopia. It is a condition where near objects are clear, but distant objects appear blurry.

Answer

C. Elongation of the eyeball. This causes the image to focus in front of the retina instead of on it.

Answer

B. Concave lens. It diverges light rays, helping to focus the image correctly on the retina.

Answer

B. Farsightedness. It is a condition where distant objects are clear, but near objects appear blurry.

Answer

B. Shortening of the eyeball. This causes the image to focus behind the retina instead of on it.

Answer

B. Convex lens. It converges light rays, helping to focus the image correctly on the retina.

Answer

C. Age-related farsightedness. It occurs due to the gradual loss of flexibility in the lens with age.

Answer

C. Using bifocal lenses. These lenses have two different focal lengths for near and distant vision.

Answer

A. A condition where the cornea or lens is irregularly shaped. This causes blurred vision at all distances.

Answer

C. Using cylindrical lenses. These lenses have different curvatures in different directions to compensate for the irregular shape of the cornea or lens.

Answer

D. Difficulty reading. This is a symptom of hypermetropia or presbyopia.

Answer

C. LASIK surgery. It reshapes the cornea to improve vision.

Answer

D. All of the above.

Answer

B. 18 years. The eye should be fully developed before undergoing the procedure.

Answer

B. Injury to the eye. While eye injuries can cause other vision problems, they do not typically cause presbyopia.

Answer

B. It bends at the interface of the two media. This phenomenon is called refraction.

Answer

A. The angle between the incident ray and the normal.

Answer

B. The angle between the refracted ray and the normal.

Answer

B. It decreases. Glass is a denser medium than air.

Answer

A. Angle of incidence is greater than the angle of refraction.

Answer

B. A transparent object with two non-parallel faces.

Answer

A. The angle between the incident ray and the emergent ray.

Answer

B. It splits into its constituent colors. This phenomenon is called dispersion.

Answer

C. Violet. Violet light has the shortest wavelength and hence bends the most.

Answer

C. Dispersion. It occurs because different colors of light bend at different angles when passing through a prism.

Answer

C. Isaac Newton.

Answer

B. VIBGYOR. It stands for Violet, Indigo, Blue, Green, Yellow, Orange, and Red.

Answer

D. Violet.

Answer

C. Because it refracts different colors differently.

Answer

B. They form white light.

Answer

D. All of the above.

Answer

C. Aurora borealis. It is caused by the interaction of charged particles from the sun with the Earth’s atmosphere.

Answer

B. Refraction and dispersion of sunlight by raindrops.

Answer

A. When the sun is behind you and rain is falling in front of you.

Answer

A. Reversed.

Answer

B. Because of the scattering of blue light by air molecules.

Answer

B. Rayleigh scattering.

Answer

A. Because the Earth’s atmosphere absorbs more blue light at these times.

Answer

B. Because of the atmospheric refraction.

Answer

A. The bending of light as it passes through the Earth’s atmosphere.

Answer

B. Because the Earth’s atmosphere has a varying refractive index.

Answer

B. It decreases with altitude. Air is denser near the Earth’s surface.

Answer

A. Twinkling of stars.

Answer

B. Because of the atmospheric refraction. The light from stars bends as it passes through the Earth’s atmosphere, causing their apparent position to change slightly.

Answer

A. Because they are closer to Earth than stars. Planets appear as tiny discs, and the twinkling of individual points on the disc averages out.

Answer

A. The sun appearing to rise earlier than it actually does. This is due to the refraction of sunlight by the Earth’s atmosphere.

Answer

D. The sun appearing to set later than it actually does. This is also due to the refraction of sunlight by the Earth’s atmosphere.

Answer

D. Formation of mirages. Mirages are caused by the refraction of light through layers of air with different temperatures.

Answer

A. It makes them appear higher in the sky than they actually are.

Answer

A. The ratio of the speed of light in vacuum to the speed of light in the medium.

Answer

B. Air has a lower refractive index than water.

Answer

A. The variation in the refractive index of the Earth’s atmosphere.

Answer

A. Because of atmospheric refraction.

Answer

A. Because of atmospheric refraction.

Answer

A. It increases the duration of daylight.

Answer

A. Because of atmospheric refraction.

Answer

B. The twinkling of stars.

Answer

C. It makes the moon appear higher in the sky.

Answer

A. Denser air has a higher refractive index.

Answer

C. The spreading of light in all directions by particles in a medium.

Answer

A. The scattering of light by colloidal particles.

Answer

B. A beam of light passing through a colloidal solution.

Answer

A. Because air molecules scatter blue light more than other colors.

Answer

A. The scattering of light by particles smaller than the wavelength of light.

Answer

A. Because there is no atmosphere in space to scatter light.

Answer

A. Because red light is scattered the least by air molecules.

Answer

D. Violet.

Answer

A. Shorter wavelengths are scattered more.

Answer

A. Because the sunlight travels through more of the Earth’s atmosphere, scattering away the blue light.

Answer

A. Because colloidal particles are larger than solute particles in a true solution.

Answer

A. Because blue light is scattered more, leaving behind more red light in the direct sunlight.

Answer

C. Scattering.

Answer

B. Much smaller than the wavelength of light.

Answer

A. Because they scatter all colors of light equally.

Answer

B. Absorption of other colors and scattering of blue light by water molecules.

Answer

A. Because of the scattering of blue light by air molecules.

Answer

A. Because fog droplets scatter light in all directions.

Question 13

Question 13: What is the far point of the eye?

A. The closest point the eye can see clearlyB. The farthest point the eye can see clearlyC. The point at which the eye is most strainedD. The point where light is most dispersed

Question 14

Question 14: What is the far point for a person with normal vision?

A. 25 cmB. 1 meterC. 10 metersD. Infinity

Question 15

Question 15: Which of the following is a condition that causes the lens of the eye to become cloudy?

A. MyopiaB. HypermetropiaC. CataractD. Presbyopia

Question 16

Question 16: How can a cataract be treated?

A. Using a concave lensB. Using a convex lensC. Through cataract surgeryD. It cannot be treated

Question 17

Question 17: What happens to the focal length of the eye lens when the ciliary muscles relax?

A. It decreases.B. It increases.C. It remains the same.D. It becomes negative.

Question 18

Question 18: What is the least distance of distinct vision for a normal eye?

A. 10 cm.B. 15 cm.C. 20 cm.D. 25 cm.

Question 19

Question 19: What type of image is formed on the retina of the human eye?

A. Inverted and real.B. Upright and real.C. Inverted and virtual.D. Upright and virtual.

Question 20

Question 20: Which of the following is NOT a refractive defect of the human eye?

A. Myopia.B. Hypermetropia.C. Presbyopia.D. Glaucoma.

Question 21

Question 21: Which of the following is a common refractive error of the eye?

A. CataractB. GlaucomaC. MyopiaD. Conjunctivitis

Question 22

Question 22: What is the main cause of myopia?

A. Weakening of the ciliary musclesB. Clouding of the lensC. Elongation of the eyeballD. Shortening of the eyeball

Question 23

Question 23: Which type of lens is used to correct myopia?

A. Convex lensB. Concave lensC. Bifocal lensD. Cylindrical lens

Question 24

Question 24: What is hypermetropia?

A. NearsightednessB. FarsightednessC. AstigmatismD. Presbyopia

Question 25

Question 25: What is the main cause of hypermetropia?

A. Elongation of the eyeballB. Shortening of the eyeballC. Weakening of the ciliary musclesD. Clouding of the lens

Question 26

Question 26: Which type of lens is used to correct hypermetropia?

A. Concave lensB. Convex lensC. Bifocal lensD. Cylindrical lens

Question 27

Question 27: What is presbyopia?

A. Nearsightedness in childrenB. Farsightedness in childrenC. Age-related farsightednessD. Age-related nearsightedness

Question 28

Question 28: How is presbyopia corrected?

A. Using concave lensesB. Using convex lensesC. Using bifocal lensesD. It cannot be corrected

Question 29

Question 29: What is astigmatism?

A. A condition where the cornea or lens is irregularly shapedB. A condition where the eye cannot focus on objects at any distanceC. A condition where the eye is unable to produce tearsD. A condition where the optic nerve is damaged

Question 30

Question 30: How is astigmatism corrected?

A. Using concave lensesB. Using convex lensesC. Using cylindrical lensesD. It cannot be corrected

Question 31

Question 31: Which of the following is NOT a common symptom of myopia?

A. Difficulty seeing distant objects clearlyB. HeadachesC. Squinting to see betterD. Difficulty reading

Question 32

Question 32: What is the name of the surgery that can be used to correct refractive errors?

A. Cataract surgeryB. Glaucoma surgeryC. LASIK surgeryD. Retina surgery

Question 33

Question 33: Which of the following is a possible complication of LASIK surgery?

A. Dry eyesB. Halos around lightsC. Undercorrection or overcorrectionD. All of the above

Question 34

Question 34: What is the recommended age for LASIK surgery?

A. 10 yearsB. 18 yearsC. 25 yearsD. 50 years

Question 35

Question 35: Which of the following is NOT a cause of presbyopia?

A. AgingB. Injury to the eyeC. DiabetesD. Genetics

Question 36

Question 36: What happens when light passes from one medium to another?

A. It travels in a straight line.B. It bends at the interface of the two media.C. It is completely absorbed.D. It is completely reflected.

Question 37

Question 37: What is the angle of incidence?

A. The angle between the incident ray and the normalB. The angle between the refracted ray and the normalC. The angle between the incident ray and the refracted rayD. The angle between the normal and the surface

Question 38

Question 38: What is the angle of refraction?

A. The angle between the incident ray and the normalB. The angle between the refracted ray and the normalC. The angle between the incident ray and the refracted rayD. The angle between the normal and the surface

Question 39

Question 39: What happens to the speed of light when it travels from air to glass?

A. It increases.B. It decreases.C. It remains the same.D. It becomes zero.

Question 40

Question 40: What is the relationship between the angle of incidence and the angle of refraction when light travels from a rarer to a denser medium?

A. Angle of incidence is greater than the angle of refraction.B. Angle of incidence is less than the angle of refraction.C. Angle of incidence is equal to the angle of refraction.D. There is no relationship between the two angles.

Question 41

Question 41: What is a prism?

A. A transparent object with two parallel facesB. A transparent object with two non-parallel facesC. An opaque object with two parallel facesD. An opaque object with two non-parallel faces

Question 42

Question 42: What is the angle of deviation?

A. The angle between the incident ray and the emergent rayB. The angle between the incident ray and the normalC. The angle between the emergent ray and the normalD. The angle between the prism faces

Question 43

Question 43: What happens to white light when it passes through a prism?

A. It remains white.B. It splits into its constituent colors.C. It is completely absorbed.D. It is completely reflected.

Question 44

Question 44: Which color of light deviates the most when white light passes through a prism?

A. RedB. GreenC. VioletD. Yellow

Question 45

Question 45: What is the phenomenon of splitting of white light into its constituent colors called?

A. RefractionB. ReflectionC. DispersionD. Diffraction

Question 46

Question 46: Which scientist is credited with the discovery of dispersion of light?

A. Albert EinsteinB. Galileo GalileiC. Isaac NewtonD. Johannes Kepler

Question 47

Question 47: What is the acronym used to remember the colors of the spectrum?

A. ROYGBIVB. VIBGYORC. GYORVIBD. BIVGYOR

Question 48

Question 48: Which color of light has the longest wavelength?

A. VioletB. GreenC. YellowD. Red

Question 49

Question 49: Which color of light has the shortest wavelength?

A. RedB. GreenC. YellowD. Violet

Question 50

Question 50: Why does a prism disperse white light?

A. Because it reflects different colors differently.B. Because it absorbs different colors differently.C. Because it refracts different colors differently.D. Because it diffracts different colors differently.

Question 51

Question 51: What happens when the colors of the spectrum are recombined?

A. They form black light.B. They form white light.C. They form a rainbow.D. They cancel each other out.

Question 52

Question 52: How did Newton demonstrate the recombination of white light?

A. By using a second prism to recombine the dispersed colors.B. By shining white light through two prisms placed opposite to each other.C. By using a concave mirror to focus the dispersed colors.D. All of the above.

Question 53

Question 53: Which of the following is NOT a natural phenomenon that demonstrates dispersion of light?

A. RainbowB. MirageC. Aurora borealisD. Halo

Question 54

Question 54: What causes a rainbow?

A. Reflection of sunlight by raindrops.B. Refraction and dispersion of sunlight by raindrops.C. Diffraction of sunlight by raindrops.D. Scattering of sunlight by raindrops.

Question 55

Question 55: When can you see a rainbow?

A. When the sun is behind you and rain is falling in front of you.B. When the sun is in front of you and rain is falling behind you.C. When the sun is overhead and rain is falling around you.D. When it is raining at night.

Question 56

Question 56: What is the order of colors in a secondary rainbow compared to a primary rainbow?

A. Reversed.B. The same.C. Random.D. There are no colors in a secondary rainbow.

Question 57

Question 57: Why does the sky appear blue?

A. Because of the reflection of blue light from the oceans.B. Because of the scattering of blue light by air molecules.C. Because of the absorption of all other colors except blue by the atmosphere.D. Because of the emission of blue light by the sun.

Question 58

Question 58: What is the name of the phenomenon responsible for the blue color of the sky?

A. Tyndall effectB. Rayleigh scatteringC. Mie scatteringD. Raman scattering

Question 59

Question 59: Why does the sun appear reddish at sunrise and sunset?

A. Because the Earth’s atmosphere absorbs more blue light at these times.B. Because the Earth’s atmosphere scatters more red light at these times.C. Because the sun emits more red light at these times.D. Because the sun is closer to the horizon at these times.

Question 60

Question 60: Why do stars twinkle?

A. Because of the variations in their brightness.B. Because of the atmospheric refraction.C. Because of their large distance from Earth.D. Because of their movement in space.

Question 61

Question 61: What is atmospheric refraction?

A. The bending of light as it passes through the Earth’s atmosphereB. The reflection of light by the Earth’s atmosphereC. The scattering of light by the Earth’s atmosphereD. The absorption of light by the Earth’s atmosphere

Question 62

Question 62: Why does atmospheric refraction occur?

A. Because the Earth’s atmosphere has a uniform refractive indexB. Because the Earth’s atmosphere has a varying refractive indexC. Because the Earth’s atmosphere is composed of different gasesD. Because the Earth’s atmosphere contains dust particles

Question 63

Question 63: How does the refractive index of air change with altitude?

A. It increases with altitude.B. It decreases with altitude.C. It remains constant with altitude.D. It fluctuates randomly with altitude.

Question 64

Question 64: Which of the following phenomena is caused by atmospheric refraction?

A. Twinkling of starsB. Formation of rainbowsC. Blue color of the skyD. Red color of the sunset

Table of Contents

Introduction

Power of Accommodation

Defects of Vision and Their Correction

Refraction of Light

Dispersion of White Light

Atmospheric Refraction

Scattering of Light

Most Asked Important Questions on The Human Eye and the Colourful World

What is the function of the eye lens?

What is the power of accommodation?

What is the least distance of distinct vision?

What are the common defects of vision and how are they corrected?

What is the difference between myopia and hypermetropia?

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