Wave OpticsHard

Question

M1 and are plane mirrors and kept parallel to each other. At point O there will be a maxima for wavelength λ. Light from monochromatic source S of wavelength λ is not reaching directly on the screen. Then λ is  : [D > > d > > λ]


Options

A.
B.
C.
D.

Solution


For reflected light waves the two virtual source (images of source in mirrors) at a distance ′3d′ Path difference at O - S2O - S1O

⇒ D2 + 4d2 = D2 + d2 + λ2 +
⇒ 3d2 = 2Dλ ⇒ λ =

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