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Q.

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

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a

$2 \times 10^{5}$

b

$2 \times 10^{6}$

c

$2 \times 10^{2}$

d

$2 \times 10^{4}$

answer is B.

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Detailed 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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