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In Young's double slit experiment , frin...

In Young's double slit experiment , fringes of width `beta` are produced on a screen kept at a distance of 1 m from the slit . When the screen is moved away by `5 xx 10^(-2)` m , fringe width changes by `3 xx 10^(-5) `m . The separation between the slits is `1 xx 10^(-3)` m . The wavelength of the light used is ....nm

A

600

B

700

C

400

D

500

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