In Young’s double-slit experiment, an interference pattern is obtained on a screen by a light of wavelength ${6000\mathop {\rm A}\limits^ \circ }$, coming from the coherent sources ${S_1}\;and\;{S_2}$. At certain point $P$ on the screen third dark fringe is formed. Then the path difference ${S_1}P - {S_2}P$ in microns is

JEE PHYSICS MCQ: WAVE OPTICS

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In Young’s double-slit experiment, an interference pattern is obtained on a screen by a light of wavelength

{6000\mathop \mathrm{A}\limits^ \circ }

, coming from the coherent sources

{S_1}\;and\;{S_2}

. At certain point

P

on the screen third dark fringe is formed. Then the path difference

{S_1}P - {S_2}P

in microns is

View answer and explanation

Correct option: B

1.5

Option B (1.5) is correct because the path difference for the third dark fringe in Young's double-slit experiment is (2n-1)λ/2, where n=3.

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10^{-3}

500 {~nm}

0.01\;SI

200\;kg{m^{ - 3}}

0.25\;m

0.4\;rad