First slide

Resolving power of optical instruments

Question

The resolving power of a telescope whose lens has a diameter of 1.22 m for a wavelength of 5000 Å is

Moderate

A

$2 \times 10^{5}$
B

$2 \times 10^{6}$
C

$2 \times 10^{2}$
D

$2 \times 10^{4}$

Solution

Resolving power $= \frac{d}{1 .22 λ} = \frac{1 .22}{1 .22 \times 5000 \times 10^{- 10}} = 2 \times 10^{6}$

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