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In double slit experiment, the angular width of the fringes is `0.20^@` for the sodium light `(lambda=5890Å)`. In order to increase the angular width of the fringes by `10%`, the necessary change in the wavelength is
A. (a) Increase of `589Å`
B. (b) Decrease of `589Å`
C. (c) Increase of `6479Å`
D. (d) Zero

1 Answer

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Best answer
Correct Answer - A
`theta=lambda/d, theta` can be increased by increasing `lambda`, so here `lambda` has to be increased by `10%`
i.e., % Increase `=10/100xx5890=598Å`

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