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In a biprism expeirment , light of wavel...

In a biprism expeirment , light of wavelenght 5200Å is ued to get an interference pattern on a screen. The fringe width changes by `0.13` mm when the screen is brought towards the biprism by 50 cm . The distance between the virtual images of the slit is

A

2 mm

B

1 mm

C

`0.5` mm

D

2 cm

Text Solution

Verified by Experts

The correct Answer is:
A
`(beta_(2)-beta_(1))=((D_(2)-D_(1))lamda)/(d)`
`:.d=(0.5xx5.2xx10^(-7))/(1.3xx10^(-4))=2mm`
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