First slide

Resolving power of optical instruments

Question

If diameter of objective lens of a telescope is 4.0 m and mean wavelength of light is
600 nm. Find resolving power.

Moderate

A

$5.46 \times 10^{4}$
B

$5.46 \times 10^{5}$
C

$5.46 \times 10^{6}$
D

$5.46 \times 10^{7}$

Solution

$R e s o l v i n g p o w e r = \frac{D}{1.22 λ} = \frac{4}{1.22 \times 6 \times 10^{- 7}} = 5.46 \times 10^{6}$

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