Diameter of the objective lens of a telescope is 250 cm. For light of wavelength 600 nm. coming from a distant object, the limit of resolution of the telescope is close to :

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Physics

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Question

1.5 × 10^–7 rad

4.5 × 10^–7 rad

3.0 × 10^–7 rad

2.0 × 10^–7 rad

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Limit of resolution $= \frac{1 .22 λ}{d}$

$= \frac{1 .22 \times 600 \times 10^{- 9}}{250 \times 10^{- 2}}$

= 2.9 × 10^–7 rad.