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  • A monochromatic beam of light falls on YDSE apparatus at some angle (say ) as shown in fi

A monochromatic beam of light falls on YDSE apparatus at some angle (say \mathrm{\theta} ) as shown in figure. A thin sheet of glass is inserted in front of the lower slit \mathrm{S_2. } The central bright fringe (path difference \mathrm{=0} ) will be obtained

Option: 1

At O


Option: 2

Above O


Option: 3

Below O


Option: 4

Anywhere depending on angle  \theta , thickness of plate  t and refractive index of glass  \mu


Answers (1)

best_answer

If  \mathrm{ d \sin \theta=(\mu-1) t}, central fringe is obtained at O

If  \mathrm{ d \sin \theta>(\mu-1) t}, central fringe is obtained above O and

If  \mathrm{ d \sin \theta<(\mu-1) t}, central fringe is obtained below O.

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