Wave Optics

JEE Main level, single correct, medium

111 of 191

Question 111 of 191

This question has Statement-1 and Statement-2. Of the four choices given after the Statements, choose the one that best describes the two Statements.
Statement-1: In Young's double slit experiment, the number of fringes observed in the field of view is small with longer wavelength of light and is large with shorter wavelength of light.
Statement-2: In the double slit experiment the fringe width depends directly on the wavelength of light.

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Answer: (C) Statement-1 is true Statement-2 is true and the Statement-2 is not correct explanation of the Statement-1.

Fringe width B=Ddλ\mathrm{B}=\frac{\mathrm{D}}{\mathrm{d}} \lambda
And number of fringes observed in the field of view is obtained by dλ\frac{\mathrm{d}}{\lambda}

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