In Fig., PQ represents a plane wavefront and AO and BP the corresponding extreme rays of monochromatic light of wavelength lambda. The value of angle theta for which the ray BP and the reflected ray OP interfere constructively is given by :

In Fig., PQ represents a plane wavefront and AO and BP the correspo

1.	In Fig., PQ represents a plane wavefront and AO and BP the corresponding extreme rays of monochromatic light of wavelength lambda. The value of angle theta for which the ray BP and the reflected ray OP interfere constructively is given by :
Answer» `cos theta =(lambda)/(2D)` `cos theta =(lambda)/(4d)` `SEC theta =(lambda)/(3D)` `sec theta =(2lambda)/(3d)` Answer :B

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In Fig., PQ represents a plane wavefront and AO and﻿ BP the corresponding extreme rays of monochromatic﻿ light of wavelength lambda. The value of angle theta for which﻿ the ray BP and the reflected ray OP interfere constructively is given by :

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In Fig., PQ represents a plane wavefront and AO and BP the corresponding extreme rays of monochromatic light of wavelength lambda. The value of angle theta for which the ray BP and the reflected ray OP interfere constructively is given by :