Question

For a diffraction grating, what is the advantage of (a) many slits, (b) closely spaced slits?

Answer 1

Solution:

(a):

The advantage of having many slits in a diffraction grating is that this makes the bright maxima in the interference pattern more sharply defined , brighter and narrower.

(b):

The advantage of having closely spaced slits in a diffraction grating is that this spreads out the bright maxima in the interference pattern and makes them easier to measure.