CBSE Class 10 Science 2019 · Paper 31/1/2/C · Question 5(b)

Light - Reflection and Refraction 2 marks Medium

The refractive index of a medium Y with respect to medium X is 1.6 and the absolute refractive index of X is 1.5. Find out the speed of light in the medium Y. The speed of light in vacuum is

3 \times 1 0^{8} ms^{- 1}

Answer

The speed of light in medium Y is $1.25 \times 1 0^{8}$ m/s.

The speed of light in medium Y is

v_{Y} = 1.25 \times 1 0^{8} m s^{- 1}

. (Absolute refractive index of Y:

n_{Y} = n_{Y X} \times n_{X} = 1.6 \times 1.5 = 2.4

, so

v_{Y} = \frac{c}{n _{Y}} = \frac{3 \times 1 0 ^{8}}{2.4} = 1.25 \times 1 0^{8}

m s

^{- 1}

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CBSE Class 10 Science 2019 · Paper 31/1/2/C · Question 5(b)

Answer

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