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In the adjacent diagram, CP represents a...

In the adjacent diagram, CP represents a wavefront and AO & BP, the corresponding two rays. Find the condition on `theta` for constructive interference at P between the ray BP and reflected ray OP.

A

`cos theta=3lambda//2d`

B

`cos theta=lambda//4d`

C

`sec theta-cos theta=lambda//d`

D

`sec theta-cos theta=4lambda//d`

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