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101. The absolute refractive index of a medium is 1.5. Then what would be the velocity of light in this medium? (NTSE Odisha, Stage-I, 2016-17)

2 x 10^{8} m/s

1.5 x 10^{8} m/s

3.5 x 10^{8} m/s

2.5 x 10^{8} m/s

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102. A convex lens of glass has power P in air. If it is immersed in water, its power will be (NTSE West Bengal, Stage-I, 2015-16)

More than P

Less than P

P

More the P for some colours and less than P for others

103. Light year is the unit to measure (NTSE Tamil Nadu, Stage-I, 2014-15)

The distance travelled by the light in a year

The distance travelled by the atoms in a year

The distance travelled by the earth in a year

The distance travelled by the sound in a year

104. A ray of light is incident in medium 1 on a surface that separates medium 1 from medium 2. Let v_{1} and v_{2} represent the velocity of light in medium 1 and medium 2 respectively. Also let n_{12} and n_{21} represent the refractive index of medium 1 with respect to medium 2 and refractive index of medium 2 with respect to medium 1, respectively. If i and r denote the angle of incidence and angle of refraction, then (NTSE Stage-II, 2013-14)

105. A convex lens has a focal length of 0.5 m. It has to be combined with a second lens, so that the combination has a power of 1.5 diopter. Which of the following could be the second lens? (NTSE Stage-II, 2013-14)

A concave lens of focal length 2 m

Another convex lens of focal length 0.5 m

A concave lens of focal length 0.5 m

A convex lens of focal length 2 m

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