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  • In a double slit experiment the distance between the slits is d. The screen is at a distance D from the slits. The order of the fringe which appears opposite to the slit on the screen is<div cl

In a double slit experiment the distance between the slits is d. The screen is at a distance D from the slits. The order of the fringe which appears opposite to the slit on the screen is

Option: 1

d^{2} / 2 \lambda D


Option: 2

2 \lambda D / d^{2}


Option: 3

d / \lambda D


Option: 4

2 d / \lambda D


Answers (1)

best_answer

The position of the bright fringe is opposite to the slit, hence d / 2 must be equal to integral multiple of the fringe width \mathrm{(\lambda D / d)}.

\mathrm{ Thus\, \frac{d}{2} =n \cdot \frac{\lambda D}{d}}

\mathrm{ \Rightarrow \quad n =\frac{d^{2}}{2 \lambda D}}

Posted by

Sayak

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