Optics Question 1094

Question: In double slit experiment, the angular width of the fringes is 0.20o for the sodium light (l = 5890AA ). In order to increase the angular width of the fringes by 10%, the necessary change in the wavelength is

[MP PMT 1997]

Options:

A) Increase of 589AA

B) Decrease of 589AA

C) Increase of 6479AA

D) Zero

Show Answer

Answer:

Correct Answer: A

Solution:

θ=λd;θ can be increased by increasing l, so here l has to be increased by 10% i.e., % Increase =10100×5890=589AA



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