Question

obtain an expression for the first minimum of diffraction pattern​

Answer 1

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Answer:

Diffraction from a single slit gives a characteristic pattern. It also complicates the pattern from Young's experiment. Here we use phasor addition to derive the intensity as a function of angle for both situations. This page supports the multimedia tutorial

Explanation:

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The sketch shows the view from above a single slit. Let's assume that the slit is constant width and very tall compared with that width, so that we can consider the system as two-dimensional. With light at normal incidence, the pattern is symmetrical about the axis of the slit. On a distant screen, the light arriving on the axis from all points in the slit has travelled an equal distance from the slit, so the centre of the pattern is a maximum. The next question is what determines its width.

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@mihirsingh

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