First slide

The optical instruments

Question

To increase both the resolving power and magnifying power of a telescope.

Moderate

A

Both the focal length and aperture of the objective has to be increased
B

The focal length of the objective has to be increased
C

The aperture of the objective has to be increased
D

The wavelength of light has to be decreased

Solution

Decreasing the wavelength of light, increases the resolving power and magnifying power of telescope.
$RP = \frac{a}{1.22 λ} m = - \frac{f_{0}}{f_{e}} (1 + \frac{f_{e}}{D})$

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