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71. Refractive index of a medium with respect to air is μ = √2, find the critical angle between the two medium (NTSE West Bengal, Stage-I, 2015-16)
300
900
450
600
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72. A student has been given a project to prepare an astronomical telescope, she has to select two lenses of type (NTSE Karnataka, Stage-I, 2016-17)
Concave lenses of different focal length
Concave lenses of same focal length
Convex lenses of different focal length
Convex lenses of same focal length
73. The focal length of a spherical mirror is 20 cm. The radius of curvature of this mirror will be (NTSE Madhya Pradesh, Stage-I. 2015-16)
10 cm
20 cm
40 cm
80 cm
74. A mirror forms a virtual, erect and small image then kind of mirror is (NTSE Chhattisgarh, Stage-I, 2015-16)
Plane
Concave
Convex
Both (A) and (B)
75. If the upper half of convex lens is wrapped with a black paper, then how the image formed by it will be effected (NTSE Chhattisgarh, Stage-I, 2015-16)
The size of the image is reduced to one half
The upper part of the image is reduced
The intensity of the image is reduced
There will be no effect on image
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