Question

The resolving power of a grating is inversely proportional to the wavelength of the incident light.

(a) True

(b) False

This question was posed to me by my college director while I was bunking the class.

Question is from Resolving Power of Grating in portion Diffraction of Engineering Physics II

Answer 1

Right option is (a) True

To elaborate: As we know, the resolving power of a grating = nN

Now, n = (e + d) sinΘ / λ, where e + d is the width of the ruled surface of the grating.

Thus, Resolving power = N (e + d) sinΘ / λ.

Hence, the resolving power is inversely proportional to the wavelength of incident light.