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

Light - Reflection and Refraction 2 marks Easy

Light enters from air to glass having refractive index 1.50. Calculate the speed of light in the glass. Given : The speed of light in vacuum is =

3 \times 1 0^{8}

m/s.

Answer

The speed of light in the glass is $2 \times 1 0^{8}$ m/s.

Speed of light in the glass:

v_{g} = \frac{c}{n _{g}} = \frac{3 \times 1 0 ^{8}}{1.50} = 2 \times 1 0^{8}

m/s.

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