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76. The refractive index of water and glass with respect to air are and respectively. The refractive index of glass with respect to water will be (NTSE Uttar Pradesh, Stage-I, 2016-17)
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77. The total internal reflection of light is not possible, when light travels from (NTSE Uttar Pradesh, Stage-I, 2016-17)
Glass to water
Water to glass
Water to air
Glass to air
78. A thin symmetric double convex lens of power P is cut into three parts A, Band C as shown. The power of (NTSE Haryana, Stage-I, 2016-17)
A is P, B is
A is 2P, B is
A is , B is
79. Two points P and Q lie on either side of an axis xy as shown. It is desired to produce an image of P at Q using a spherical mirror with xy as the optic axis. The spherical mirror must be (NTSE Haryana, Stage-I, 2016-17)
Converging and positioned with left of P
Diverging and positioned with right of Q
Diverging
Converging, positioned to the right of Q
80. A rod of length 5 cm lies along the principal axis of the concave mirror of focal length 15 cm in such a way that the end of the closer to the pole is 30 cm away from it. Then the length of the image (NTSE Jharkhand, Stage-I, 2016-17)
2.75 cm
3.75 cm
4.75 cm
None of these
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and 
respectively. The refractive index of glass with respect to water will be 
, B is 
