Optics Question 227

Question: A light wave is incident normally over a slit of width 24×105cm . The angular position of second dark fringe from the central maxima is 30o. What is the wavelength of light

[RPET 1995]

Options:

A) 6000AA

B) 5000AA

C) 3000AA

D) 1500AA

Show Answer

Answer:

Correct Answer: A

Solution:

For second dark fringe dsinθ=2λ

24×105×102×sin30=2λ

λ=6×107m=6000AA



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