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ICSE Class 10 Physics Question 3 of 19

Refraction of Light at Plane Surfaces — Question 13

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Question

Question 13

The refractive index of water is 4/3 and that of glass is 3/2. The refractive index of glass with respect to water is:

  1. 9/8
  2. 2
  3. 8/9
  4. 1
Answer

9/8

Reason — Given,

aμw = 43\dfrac{4}{3}

aμg = 32\dfrac{3}{2}

wμg = Refractive index of glass Refractive index of water\dfrac{\text{Refractive index of glass }}{\text {Refractive index of water}}

Substituting we get,

wμg = 3/2 4/3\dfrac{\text{3/2 }}{\text {4/3}} = 3 x 3 2 x 4\dfrac{\text{3 x 3 }}{\text {2 x 4}} = 98\dfrac{9}{8}

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