Optics Question 877

Question: In a Young’s double slit experiment, if the incident light consists of two wavelengths λ1 and λ2 , the slit separation is d, and the distance between the slit and the screen is D, the maxima due to the two wavelengths will coincide at a distance from the central maxima, given by:

Options:

A) λ1λ22Dd

B) (λ1λ2).2dD

C) LCM of λ1.Dd and λ2.Dd

D) HCF of λ1Dd and λ2Dd

Show Answer

Answer:

Correct Answer: C

Solution:

[c] yn=nDλ1d=(n+1)Dλ2d

or n=(λ2λ2λ1)

and yn=(λ1λ2λ2λ1)(Dd) .



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