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In a double slit experiment the angular ...

In a double slit experiment the angular width of a fringe is found to be `0.2^(@)` on a screen placed I m away. The wavelength of light used in 600 nm. What will be the angular width of the fringe if the entire experimental apparatus is immersed in water ? Take refractive index of water to be `4//3`.

A

`0.1^(@)`

B

`0.266^(@)`

C

`0.15^(@)`

D

`0.05^(@)`

Text Solution

Verified by Experts

The correct Answer is:
C
For double slit experiment
Angular width for first minima `=(lambda)/(2d)proplambda`
`(theta)/(theta')=(lambda)/(lambda')=(lambda)/(((lambda)/(mu)))=mu`
`theta'=(theta)/(mu)=(0.2^(@))/((4)/(3))=0.15^(@)`
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