First slide

Resolving power of optical instruments

Question

The diameter of objective of a telescope is 1m. Its resolving limit for the light of wave length 4538 Å, will be

Moderate

A

$5 .54 \times 10^{- 7} rad$
B

$2 .54 \times 10^{- 4} rad$
C

$6 .54 \times 10^{- 7} rad$
D

None of these

Solution

Resolving limit
$dθ = \frac{1 .22 λ}{a} = \frac{1 .22 \times 4538 \times 10^{- 10}}{1} = 5 .54 \times 10^{- 7} rad$

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