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A ray of light of intensity I is incident on a parallel glass slab at point A as shown in diagram. It undergoes partial reflection and refraction. At each reflection, 25 % of incident energy is reflected. The rays AB and A ^ B ^ undergo interference. The ratio of I _ and I _ is :

Options

  1. A49: 1
  2. B7: 1
  3. C4: 1
  4. D8: 1

Correct answer

A. 49: 1

Step-by-step solution

From figure I₁= I 4 and I₂= 9 I 64 I₂ I₁ = 9 16 By using I_ I_ = ( I₂ I₁ +1 I₂ I₁ -1 )^2= ( 9 16 +1 9 16 -1 )^2= 49 1

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