First slide

Resolving power of optical instruments

Question

The angular resolution of a 10 cm diameter telescope at a wavelength of 5000 Å is of the order

Moderate

A

$10^{6} rad$
B

$10^{- 2} rad$
C

$10^{- 4} rad$
D

$10^{- 6} rad$

Solution

$Angular resolution dθ = \frac{1 .22 λ}{a} = \frac{1 .22 \times 5000 \times 10^{- 10}}{10 \times 10^{- 2}} = 6 .1 \times 10^{- 6} rad .$

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