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The refractive indes of crown glass is close to 3 / 2 . If the speed of light in air is c , then the speed of light in the crown glass will be close to

Options

  1. A(3 / 2) c
  2. B(4 / 9) c
  3. C(2 / 3) c
  4. D(9 / 4) c

Correct answer

C. (2 / 3) c

Step-by-step solution

The relationship between refractive index and speed of light in the medium is, n = Speed of light in vacuum/speed of light in medium n = c / v 3 / 2=3 10^8 / speed of light in medium Speed of light = (3 10^8 ) /(3 / 2) Where, n is the refractive index, =(2 / 3) C

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