NEET | 2017Wave OpticsEasy

Question

Young's double slit experment is first performed in air and then in a medium other than air. It is found
that 8th bright fringe in the medium lies where 5th dark fringe lies in air. The refractive index of the medium is nearly :-

Options

A.

1.59

B.

1.69

C.

1.78

D.

1.25

Solution

(y8)Bright, medium = (y5)Dark, air
8λmDd=2(5)-12λDd
8λμDd=92λDd⇒μ=169=1.78

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