CBSE Class 10 Science 2019 Outside Delhi Set 1

Question : 5

Total: 27

The absolute refractive index of Ruby is 1.7. Find the speed of light in Ruby. The speed of light in vacuum is 3×108m∕ s.

Solution:

We know that,
Refractive index of ruby (µ)
=‌

‌ Speed of light in air (or vacuum) ‌

‌ Speed of light in ruby ‌

So, 1⋅70=‌

3×108

‌ Speed of light in ruby ‌

‌ or Speed of light in ruby ‌=‌‌

3×108

1.7

ms−1
‌=1.76×108ms−1
Thus, speed of light in ruby is 1.76×108ms−1.

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