Question

Which of the following can spread out the diffraction pattern formed by a beam of monochromatic light, on a screen behind a diffraction grating?

a) Decrease the distance between the diffraction grating and the screen.

b) Decrease the number of slits on the diffraction grating.

c) Decrease the frequency of the light.

d) Increase the separation between two neighboring slits on the diffraction grating.
e) none of the above

Answer 1

The concept used is of fringe width which tell us the spread out the diffraction pattern formed by light , so if the firngw width increase then spread also increases , as frequency decreases wavelength increases means fringe width increases which  means spread increases , after applying this concept i deduced these results.

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