Diameter of the objective of a telescope is 200 cm. What is the resolving power of a telescope ? Take wavelength of light `=5000 Å`.

Options

A. `6.56 xx 10^(6)`
B. `3.28 xx 10^(5)`
C. `1 xx 10^(6)`
D. `3.28 xx 10^(6)`

Answer

D

Explanation

`RP = (D)/(1.22 lambda) = (2)/(1.22 xx 0.5 xx 10^(-6)) = (4)/(1.22) xx 10^(6)= 3.28 xx 10^(6)`