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

In Young's double-slit experiment, the slits are `2mm` apart and are illuminated by photons of two wavelengths `lambda_1=12000Å` and `lambda_2=10000Å`. At what minimum distance from the common central bright fringe on the screen `2m` from the slit will a bright fringe from one interference pattern coincide with a bright fringe from the other?

A

3.2 mm

B

6.0 mm

C

7.2 mm

D

9.2 mm

Text Solution

Verified by Experts

The correct Answer is:
B
`nlambda D/d=("x"-1)lambda xx D/d`
n=5:x=6.0mm
Hence(B) is correct
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