VARDAAN LEARNING INSTITUTE

1. The human eye acts like a __________ (Camera).
2. The __________ acts as the screen in the human eye.
3. The hole in the middle of the iris is called __________.
4. __________ muscles modify the curvature of the eye lens.
5. The image formed on the retina is __________ and inverted.
6. Myopia is also known as __________ sightedness.
7. Hypermetropia is corrected by using a __________ lens.
8. The splitting of white light into seven colors is called __________.
9. Rainbow is formed due to the dispersion of __________ light.
10. The color of the sky is blue due to __________ of light.
11. Ideally, for a normal eye, the far point is at __________.
12. The least distance of distinct vision for a young adult is __________ cm.
13. __________ is the transparent spherical membrane covering the front of the eye.
14. The space between the cornea and the eye lens is filled with __________ humour.
15. The space between the eye lens and retina is filled with __________ humour.
16. The light-sensitive cells that respond to the intensity of light are called __________.
17. The light-sensitive cells that respond to colour are called __________.
18. The distinctive colour of the eye is due to the __________.
19. Presbyopia is usually caused by the weakening of __________ muscles.
20. Astigmatism is corrected using a __________ lens.
21. The ability of the eye lens to adjust its focal length is called __________.
22. Cataract causes the eye lens to become __________ and cloudy.
23. To correct Myopia, a __________ lens is used.
24. A person responding to light but unable to distinguish colours lacks __________ cells.
25. The __________ nerve transmits electrical signals from the eye to the brain.

26. The near point of a normal eye is:
    a) 25 cm b) Infinity c) 10 cm d) 50 cm
27. The far point of a normal eye is:
    a) 25 cm b) Infinity c) 100 cm d) Zero
28. Bifocal lenses are used to correct:
    a) Myopia b) Presbyopia c) Hypermetropia d) Astigmatism
29. The black opening between the aqueous humour and the lens is called:
    a) Retina b) Iris c) Pupil d) Cornea
30. Light enters the eye through a transparent membrane called:
    a) Cornea b) Pupil c) Iris d) Retina
31. Iris controls the size of the:
    a) Lens b) Pupil c) Retina d) Cornea
32. When we enter a dark room, our pupil:
    a) Contracts b) Expands c) Remains same d) Blinks
33. The color that bends the most in a prism is:
    a) Red b) Violet c) Blue d) Green
34. Danger signals are red because red light is:
    a) Scattered most b) Scattered least c) Absorbed most d) None
35. Twinkling of stars is due to:
    a) Reflection b) Atmospheric Refraction c) Dispersion d) Scattering
36. The distinct color of a person's eye is determined by:
    a) Cornea b) Iris c) Pupil d) Retina
37. The change in focal length of an eye lens is caused by the action of the:
    a) Pupil b) Retina c) Ciliary muscles d) Iris
38. Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?
    a) Dispersion b) Scattering c) Total internal reflection d) Reflection
39. The bluish colour of water in deep sea is due to:
    a) Presence of algae b) Reflection of sky c) Scattering of light d) Absorption of light
40. At noon the sun appears white as:
    a) Light is least scattered b) All the colours are scattered away c) Blue colour is scattered the most d) Red colour is scattered the most
41. Which of the following is a natural phenomenon which is caused by the dispersion of sunlight in the sky?
    a) Twinkling of stars b) Stars seem higher than they actually are c) Advanced sunrise and delayed sunset d) Rainbow
42. The defect of vision in which a person cannot see the distant objects clearly but can see nearby objects clearly is called:
    a) Hypermetropia b) Myopia c) Presbyopia d) Cataract
43. A person cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power:
    a) +0.5 D b) -0.5 D c) +0.2 D d) -0.2 D
44. The medical condition in which the lens of the eye of a person becomes progressively cloudy resulting in blurred vision is called:
    a) Myopia b) Presbyopia c) Cataract d) Hypermetropia
45. The atmospheric refraction of light causes the twinkling of:
    a) Planets only b) Stars only c) Planets and stars d) Stars and satellites

46. A concave lens is used to correct Myopia.
47. Hypermetropia is caused due to elongation of the eyeball.
48. Presbyopia is a defect of old age.
49. The human eye lens is a concave lens.
50. Rods are responsible for color vision.
51. Rainbow is always formed in the direction of the Sun.
52. Red light scatters the most.
53. Planets twinkle just like stars.
54. Tyndall effect is related to scattering of light.
55. The sun appears red at noon.
56. The scattering of light by colloidal particles is known as Tyndall effect.
57. Blue color of the sky is due to dispersion of light.
58. Hypermetropia is also known as far-sightedness.
59. A person suffering from myopia can see distant objects clearly.
60. Ciliary muscles relax to make the eye lens thinner.
61. The blind spot contains maximum rods and cones.
62. Glass prism splits white light into 7 colours.
63. Violet light has the longest wavelength.
64. Stars twinkle due to atmospheric refraction.
65. Planets do not twinkle because they are point sources of light.
66. The danger signals are red because red colour is scattered the most by fog or smoke.
67. The sun is visible to us about 2 minutes before the actual sunrise.
68. In a prism, the angle of deviation depends on the angle of incidence.
69. Bifocal lenses consist of both concave and convex lenses.
70. When white light enters a prism, violet colour deviates the least.

71. Name the component of white light that deviates the least.
72. What is the range of vision for a normal human eye?
73. Which part of the eye provides color to the eye?
74. Name the defect where a person cannot see near objects clearly.
75. What type of lens is present in the human eye?
76. Which natural phenomenon is caused by the dispersion of sunlight by rain drops?
77. What causes the early sunrise?
78. Which cells on the retina respond to the intensity of light?
79. Who discovered that white light consists of seven colors?
80. Name the fluid present between cornea and lens.
81. Which colour of white light deviates the most when passing through a prism?
82. What is the unit of power of a lens?
83. Name the defect of vision which makes a person unable to see both near and distant objects clearly.
84. Which phenomenon is responsible for the blue colour of the sky?
85. What is the time difference between actual sunset and apparent sunset?
86. Which part of the eye controls the amount of light entering it?
87. Name the type of lens used to correct hypermetropia.
88. What is the persistence of vision for a normal human eye?
89. Name the screen on which image is formed in the eye.
90. Identify the nature of the image formed on the retina.

Match the terms in Column A with Column B:

91. Myopia - (a. Convex Lens / b. Concave Lens)
92. Hypermetropia - (a. Convex Lens / b. Concave Lens)
93. Presbyopia - (a. Bifocal Lens / b. Cylindrical Lens)
94. Electric Signal to Brain - (a. Optic Nerve / b. Ciliary Muscle)
95. Controls Focal Length - (a. Ciliary Muscles / b. Iris)
96. Scattering - (a. Blue Sky / b. Rainbow)
97. Atmospheric Refraction - (a. Twinkling Stars / b. Tyndall Effect)
98. Internal Reflection - (a. Rainbow / b. Blue Sky)
99. Retina - (a. Screen / b. Lens)
100. Pupil - (a. Window / b. Shutter)