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A beam of monochromatic light of wavelen...

A beam of monochromatic light of wavelength `lambda` falls normally on a diffraction grating of line spacing d. If `theta` is the angle between the second-order diffracted beam and the direction of the incident light, what is the value of `sin theta` ?

A

`lamda/d`

B

`d/lamda`

C

`(2lamda)/d`

D

`(2d)/(lamda)`

Text Solution

Verified by Experts

The correct Answer is:
C
In gereral, the angle of diffraction `theta` of the `n^(th)` order diffraction beam is related to the sqacing d by

`dsintheta=nlamda" ,"" "sin=(2lamda)/(d)` If n=2
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