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In a Young's double slit set-up, light f...

In a Young's double slit set-up, light from a laser source falls on a pair of very narrow slits separated by 1.0 micrometer and bright fringes separated by 1.0 millimeter are observed on a distant screen. If the frequency of the laser light is doubled, what will be the separation of the bright fringes ?

A

0.25 mm

B

0.5 mm

C

1.0 mm

D

2.0 mm

Text Solution

Verified by Experts

The correct Answer is:
B
Separation = Bright fringe = `(lambdaD)/(d)`
`flambda= c`
If f is doubled then `lambda` become halved
`:. beta` becomes half
`implies beta= (1)/(2)= 0.5 mm`
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