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  • A plane monochromatic light falls normally on a diaphragm with two narrow slits separated by a distance  <img alt="\mathrm{d=2.5 \mathrm{~mm}}" src="https://entrancecorner.oncodecogs.com/gif.l

A plane monochromatic light falls normally on a diaphragm with two narrow slits separated by a distance  \mathrm{d=2.5 \mathrm{~mm}}.A fringe pattern is formed on the screen placed at \mathrm{D=100 \mathrm{~cm}} behind the diaphragm. If one of the slits is covered by a glass plate of thickness \mathrm{10 \mu \mathrm{m}}, then distance by which these fringes will be shifted will be

Option: 1

2 \mathrm{~mm}


Option: 2

3 \mathrm{~mm}


Option: 3

4 \mathrm{~mm}


Option: 4

5 \mathrm{~mm}


Answers (1)

best_answer

\mathrm{\frac{x d}{D}(\mu-1) t \Rightarrow x=\frac{(\mu-1) t D}{d}}

\mathrm{ \text { or } x=\frac{(1.5-1) \times 10^{-3} x 100}{0.25}=0.2 \mathrm{~cm}=2 \mathrm{~mm}}

Posted by

sudhir kumar

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