In Young’s double slit experiment we get 60 fringes in the field of view of monochromatic light of wavelength ${4000\;\mathop {\rm A}\limits^ \circ }$. If we use monochromatic light of wavelength ${6000\;\mathop {\rm A}\limits^ \circ }$, then the number of fringes obtained in the same field of view are

JEE PHYSICS MCQ: WAVE OPTICS

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In Young’s double slit experiment we get 60 fringes in the field of view of monochromatic light of wavelength

{4000\;\mathop \mathrm{A}\limits^ \circ }

. If we use monochromatic light of wavelength

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

, then the number of fringes obtained in the same field of view are

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Correct option: C

Option C (40) is correct because the number of fringes is inversely proportional to the wavelength of light used.

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10^{-3}

500 {~nm}

0.01\;SI

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

0.25\;m

0.4\;rad