Question

The resolving power of a telescope is directly proportional to ______

(a) Frequency of the light used

(b) The wavelength of the light used

(c) Square of the frequency of light used

(d) Square of Wavelength of the light used

This question was posed to me in a national level competition.

Enquiry is from Resolving Power in portion Optics of Engineering Physics II

Answer 1

The correct choice is (a) Frequency of the light used

Best explanation: As we know, the resolving power of a telescope = D/1.22λ

Now, as we know λ = c/v, where v is the frequency of light.

Therefore, resolving power of a telescope = Dv/1.22

Hence, Resolving Power is directly proportional to the frequency of the light.