61. What is refractive index ?
62. A star appears twinkling in the sky because of
63. What type of lens is used in a magnifying glass
64. Time of exposure required for taking photograph of an object depends upon the
65. A concave lens always forms
66. A concave lens always forms an image which is
67. Which one of the following determines the sharpness of image in a camera ?
68. Dioptre is the unit of
69. The part of the eye having the largest refractive index is :
70. Vehicles use ________ to see the objects coming from behind.
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