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A parallel beam of light of wavelength l...

A parallel beam of light of wavelength `lambda` is incident normally on a single slit of width d. Diffraction bands are obtained on a screen placed at a distance D from the slit. The second dark band from the central bright band will be at a distance given by

A

`(2lambdaD)/(d)`

B

`lambda dD`

C

`(lambdaD)/(2d)`

D

`(2lambda d)/(D)`

Text Solution

Verified by Experts

The distance of n-th dark band from the central bright band = `(n lambda D )/(d)`
For n = 2, distance =` (2lambdaD)/(d)`
The option (A) is correct.
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