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A plane wavefront of wavelength lamda is...

A plane wavefront of wavelength `lamda` is incident on a single slit of width a. The angular width of principal maximum is

A

`lamda/a`

B

`(2lamda)/2`

C

`a/lamda`

D

`a/(2lamda)`

Text Solution

Verified by Experts

The correct Answer is:
B
If `theta` is the half angular width of principal maximum , then
`theta = lamda/a`
Thus, the angular width of principle maximum
`=2theta = (2lamda)/a`
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