JEE Main 2017 Physics question
A single slit of width is illuminated by a coherent monochromatic light of wavelength . If the second and fourth minima in the diffraction pattern at a distance cm from the slit are at cm and cm respectively from the central maximum, what is the width of the central maximum? (i.e. distance between first minimum on either side of the central maximum)
Answer: (4)
Solution
The minima of a single-slit pattern occur where , and for the small-angle (linear) regime assumed here the positions on the screen are equally spaced:
= n.
The data are consistent with this: cm and cm give the same
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