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In Young's experiment fourth bright frin...

In Young's experiment fourth bright fringe produced by light of 5000Å superposes on the fifth bright fringe of an unknown wavelength. The unknown wavelength is _________Å.

A

4000

B

6000

C

5000

D

8000

Text Solution

Verified by Experts

The correct Answer is:
A
`4 beta_1 = 5 beta_2`
`4 xx 5000 (D)/(d) = 5 xx lambda (D)/(d)`
`lambda = 4000 Å`
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