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BITSAT2016PhysicsRay OpticsActual

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 I ₁= I 4 and I ₂= 9 I 64 aligned By using I _ I _ &= ( I ₂ I ₁ +1 I ₂ I ₁ -1 )² &= ( 9 16 +1 9 16 -1 )²= 49 1 aligned

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