In Young’s double slit experiment, distance between two slits is $0.28\;{\rm{mm}}$ and distance between slits and screen is $1.4\;{\rm{m}}$. Distance between central bright fringe and third bright fringe is $0.9\;{\rm{cm}}$, what is the wavelength of light used?

$6000\mathop {\rm A}\limits^ \circ $

$4000\mathop {\rm A}\limits^ \circ $

$3000\mathop {\rm A}\limits^ \circ $

$5000\mathop {\rm A}\limits^ \circ $

JEE PHYSICS MCQ: WAVE OPTICS

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In Young’s double slit experiment, distance between two slits is

0.28\;\mathrm{mm}

and distance between slits and screen is

1.4\;\mathrm{m}

. Distance between central bright fringe and third bright fringe is

0.9\;\mathrm{cm}

, what is the wavelength of light used?

View answer and explanation

Correct option: B

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

Option B (

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

) is correct because the wavelength is calculated using the formula for fringe width in Young's double-slit experiment.