Question

How will the resolving power be effected with the increase in

1. Wavelength of light used.
2. Diameter of the objective lens.

Justify your answers.

Answer 1

Resolving power of a telescope (R) = `a/(1.22 lambda)`

Where,

a = diameter of the objective and

A = wavelength

1. When the wavelength of the light increases, the resolving power of the telescope decreases.
2. When the diameter of the objective increases, the resolving power of the telescope increases.