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66. If speed of light travelling from air to a medium decreases by 40%, find the refractive index of the medium with respect to air. (NTSE Maharashtra, Stage-I, 2015-16)
2.5
1.67
1.3
1.25
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67. A candle C is kept between two parallel mirrors, at a distance 0.2 d from the mirror 1. Here d is the distance between mirrors. Multiple images of the candle appear in both mirrors. How far behind mirror 1 are the nearest two images of the candle in that mirror? (NTSE Rajasthan, Stage-I, 2015-16)
0.2 d, 1.8 d
0.2 d, 2.2 d
0.2 d, 0.8 d
0.2 d, 1.2 d
68. A concave lens always gives a virtual image. In optical lenses worn by humans which of the following statements is true? (NTSE Stage-II,2014-15)
The lens can never be concave
In some cases the lens can be concave if the focal length is much larger than 2.5 cm
All focal length concave lenses are possible
All focal length convex lenses are possible
69. A ray of light in air is incident on an equilateral glass prism at an angle θi to the normal. After refraction, the light travelled parallel to the base of prism and emerged in air at an angle θc to the normal. If the angle between the incident and the emergent rays is 600, then the refractive index of glass with respect to air is (NTSE Stage-II,2015-16)
1.33
1.5
1.73
1.66
70. You are standing on the shore of a lake. You spot a fish swimming below the lake surface. You want to kill the fish first by throwing a spear and next, by pointing a high-power laser torch. How should you aim the spear and torch, respectively, from the options given below? (I) Above the apparent position of the fish (II) Below the apparent position of the fish (III) Directly at the apparent position of the fish (NTSE Stage-II, 2015-16)
SPEAR: II ; LASER: III
SPEAR: I ; LASER : II
SPEAR: II ; LASER: II
SPEAR: III ; LASER: III
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