CBSE Class 10 Science 2019 · Paper 31/2/1 · Question 5

Light - Reflection and Refraction 2 marks Easy

The absolute refractive index of Ruby is 1.7. Find the speed of light in Ruby. The speed of light in vacuum is

3 \times 1 0^{8}

m/s.

Answer

The speed of light in ruby is $v \approx 1.76 \times 1 0^{8}$ m/s.

Speed of light in ruby:

v = \frac{c}{n} = \frac{3 \times 1 0 ^{8}}{1.7} \approx 1.76 \times 1 0^{8}

m/s.

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