MHT CET 2022 Physics question
A thin transparent plate of thickness 't' and refractive index '' is introduced in the path of one of the two interfering waves. The path difference between these waves is changed by half the wavelength of light . The thickness of the plate is
Answer: (D)
Solution
Inserting a plate of thickness and refractive index increases the optical path of that wave by . This is the change in path difference between the two waves, which is given as . So
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