First slide

Resolving power of optical instruments

Question

The resolving power of an astronomical telescope is 0.2 seconds. If the central half portion of the objective lens is covered, the resolving power will be

Moderate

A

0.1 sec
B

0.2 sec
C

1.0 sec
D

0.6 sec

Solution

$Resolving power = \frac{a}{1 .22 λ} \frac{R_{2}}{R_{1}} = \frac{a_{2}}{a_{1}} \frac{R_{2}}{0.2} = \frac{a / 2}{a} R_{2} = 0.1 seconds$

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