Assertion : The resolving power of a telescope is more if the diameter of the objective lens is more.
Reason : Objective lens of large diameter collectd more light.

Options

A. If both Assertion and Reason are true and Reason is the correct explantion of Asssertion
B. If both Assertion and Reason are true but Reason is not the correct explanation of Assertion
C. If Assertion is ture but Reason is false
D. If both Assertion and Reason are false

Answer

A

Explanation

Resolving power of telescope `=(a)/(1.22)lambda`
Where, a is the diameter of objective lens and `lambda` is the wavelength of light used. It is obvious that on increasing a more light is collected by objective lens and so, the image formed is more bright. Thus, resolving power of telescope increases.