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A beam with wavelength lambda falls on a...

A beam with wavelength `lambda` falls on a stack of partially reflecting planes with separation `d`. The angle `theta` that the beam should make with planes so that the beams reflected from successive planes may interfere constructively is (where n=1, 2, ...)

A

`sin^(-1)((nlamda)/(d))`

B

`tan^(-1)((nlamda)/(d))`

C

`sin^(-1)((nlamda)/(2d))`

D

`cos^(-1)((nlamda)/(2d))`

Text Solution

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The correct Answer is:
C
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