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Two slits are made one millimeter apart ...

Two slits are made one millimeter apart and the screen is placed one metre away. When blue-green light of wavelength 500 nm is used, the fringe separation is

A

`5xx10^(-4)m`

B

`2.5xx10^(-3)m`

C

`2xx10^(-4)m`

D

`10xx10^(-4)m`

Text Solution

Verified by Experts

The correct Answer is:
A
Fringe width, `beta=(D lambda)/(d)`
Here, `D=1m, d=1xx10^(-3) m, lambda = 500nm=5xx 10^(-7)m`
` :. beta =(1xx5xx10^(-7))/(1xx10^(-3))=5xx10^(-4)m`
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