Questions

Two plane mirrors, a source S of light, emitting monochromatic rays of wavelength $λ$ and a screen are arranged as shown in figure. If angle $θ$ is very small, the fringe width of interference pattern formed on screen by reflected rays is:

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a+bλ4aθ

2a+bλaθ

2a+bλ4aθ

a+bλaθ

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detailed solution

Correct option is C

β=λDd=λ2acos2θ+b4acosθsinθ for small values of θ, sinθ≈0 cosθ≈1 ⇒β=λ2a+b4aθ

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