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96. If a 3 cm tall object placed perpendicular to principal axis of a convex lens of focal length 15 cm produces a real inverted image of height 15 cm, then its object distance (u) is ...... and image distance (v) is. (NTSE Maharashtra, Stage-I, 2016-17)
u = -18 m, v = +90 m
u = +18 m, v = -90 m
u = -18 cm, v = +90 cm
u = +18 cm, v = +90 cm
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97. Choose the wrong statement related to virtual image. (NTSE Maharashtra, Stage-I, 2015-16)
Images are always produced by plane mirrors only
Images are always erect
Image cannot be obtained on the screen
Image is formed at a point where incident and refracted rays appear to meet
98. A beam of light travelling in air enters into a liquid. Its speed reduces by 30%. The refractive index of liquid with respect to air is (NTSE Bihar, Stage-I, 2016-17)
99. The image created by a converging lens is projected on a screen that is 60 cm away from the lens. If the height of the image is one fourth the height of the object, what is focal length of the lens? (NTSE Bihar, Stage-I, 2016-17)
36 cm
45 cm
80 cm
48 cm
100. The refractive index of diamond with respect to glass is 1.6 and absolute refractive index of glass is 1.5. Then the absolute refractive index of diamond will be (NTSE Odisha, Stage-I, 2015-16)
2.5
2.4
3
3.5
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