Question

(b) The speed of light in diamond is found to be 1,24,000 km s-1. What is
the refractive index of diamond? Give Reason.It is of 2 Marks ​

Answer 1

Answer:

≈ 2.42  (≈ = approximately)

Explanation:

Given:

Speed of light in diamond (C₂) = 1,24,000 km/s

R.I of diamond =?

Now,

Speed of light in vacuum (C₁) = 3 × 10⁸ m/s = 30,00,00,000/1000 = 3,00,000 km/s

Now

Absolute R.I. of diamond = C₁/C₂ = 300000/124000 = 300/124 ≈ 2.419

                                          ≈ 2.42

Answer 2

Explanation:

Refractive index of the medium =

Speed of light in air

Speed of the medium in air

Refractive index of diamond =

300,000 km/s = 300

124,000 km/s = 124 ans: 2.4

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