Two nearly equal wavelengths of light are incident on an N slit grating.The two wavelengths are not resolvable.When N is increased they become resolvable.This is because:
A)more light gets through the grating
B)the lines get more intense
C)the entire pattern spreads out
D)there are more orders present
E)the lines become more narrow

Question

Quizplus · Accepted Answer

Increasing the number of slits (N) in a grating increases the resolving power, which makes the spectral lines narrower and thus allows closely spaced wavelengths to be resolved.

Two Nearly Equal Wavelengths of Light Are Incident on an N