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In a Young's double slit experiment, the...

In a Young's double slit experiment, the fringe width will remain same, if ( D = distance between screen and plane of slits, d = separation between two slits and `lambda` = wavelength of light used)

A

Both `lambda` and D are doubled

B

Both d and D are doubled

C

D is doubled but d is halved

D

`lamba` is doubled but d is halved

Text Solution

Verified by Experts

The correct Answer is:
B
Fringe width, `beta=(Dlambda)/d`
If both d and D are doubled, then
`beta'=((2D)lambda)/(2d)=(Dlambda)/d=beta`
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