Question

A ray of light enters a diamond from air. If the refractive index of diamond is 2.42, by what per cent does the speed of light reduce on entering the diamond?


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Answer 1

✯Question✯

• A ray of light enters a diamond from air. If the refractive index of diamond is 2.42, by what per cent does the speed of light reduce on entering the diamond?

✦Answer✦

• We know, n = c ÷ v     ⋆Refractive Index⋆
• c is speed of light in vacuum
• v is speed of light in diamond
• n is refractive index
• v = c ÷ n
• c ÷ 2.42 = 0.41c

✬The speed of light in diamond is therefore 41% of the speed in air or in diamond, the speed reduces by 59%

Answer 2

Answer:

✯Question✯

A ray of light enters a diamond from air. If the refractive index of diamond is 2.42, by what per cent does the speed of light reduce on entering the diamond?

✦Answer✦

We know, n = c ÷ v     ⋆Refractive Index⋆

c is speed of light in vacuum

v is speed of light in diamond

n is refractive index

v = c ÷ n

c ÷ 2.42 = 0.41c

✬The speed of light in diamond is therefore 41% of the speed in air or in diamond, the speed reduces by 59%