First slide

Young's double slit Experiment

Question

A monochromatic beam of light falls on YDSE apparatus at some angle $(say θ)$ as shown in figure. A thin sheet of glass (Refractive index = $μ$ ) is inserted in front of the lower slit S₂. The central bright fringe will be obtained

Moderate

A

at O
B

above O
C

below O
D

anywhere deepening on angle $θ,$ thickness of plate t and refractive index of glass $μ$

Solution

If d $sinθ = (μ - 1) t,$ central fringe is obtained at O.
If d $sinθ > (μ - 1) t,$ central fringe is obtained above O
and
If d $sinθ < (μ - 1) t$ central fringe is obtained below O.

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