Wave motionHard

Question

In young′s double slit experiment, the two slits are illuminated by light of wavelength 5890 (Ao) and the angular fringe width between the fringes obtained on screen is 0.2o. If the whole apparatus is immersed in water of refractive index 4/3, then the angular fringe width will be-

Options

A.0.30o
B.0.15o
C.15o
D.30o

Solution

Angular fringe width α ∝ λ

∵  λwater = ; αwater = 0.15o.

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