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Light d of wavelength 5000Å is incident ...

Light d of wavelength `5000Å` is incident normally on a slite. The first minimum of the distance of 5 mm from the central maximum on a screen placed at a distance of 2 m from the slit. The width of slit is

A

`0.1mm`

B

`0.2mm`

C

`0.3 mm`

D

`0.4 mm`

Text Solution

Verified by Experts

The correct Answer is:
B
`asintheta=nlamda`
`:.a=(1xx5xx10^(-7)xx2)/(5xx10^(-3))=0.2mm`
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