Question

How does the distance to the first maxima of the diffraction envelope change with slit width?

Answer 1

for first maximum,

dsin = ,

or, sin = /d

if slit width 'd' increases, decreases and distance to the firs maximum decreases and if the if slit width 'd' decreases, increases and distance to the firs maximum increases.

Hence, distance of first maxima increases with decrease of slit width and vice-versa.

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