1. Tardigrade
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  3. Physics
  4. When light of wavelength λ falls on a thin film of thick- ness t and refractive index n, the essential conditions for the production of constructive interference fringes by the rays A and B is: (m = 1,2,3,...)

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Q. When light of wavelength $ \lambda $ falls on a thin film of thick- ness t and refractive index n, the essential conditions for the production of constructive interference fringes by the rays A and B is: (m = 1,2,3,...)

JIPMERJIPMER 1998

Solution:

Correct answer is (a) $ 2nt\,\cos \,r=\left( m-\frac{1}{2} \right)\lambda $