Two stars are 10 light years away from the earth. They are seen through a telescope of objective diameter 30 cm. The wavelength of light is 600nm. To see the stars just resolved by the telescope, the

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Two stars are 10 light years away from the earth. They are seen through a telescope of objective diameter 30 cm. The wavelength of light is 600nm. To see the stars just resolved by the telescope, the minimum distance between them should be 1 l i g h t y e a r = 9.46 × 10 15 m of the order of :

TestHub · Accepted Answer

l = R a 1 . 22 × λ and a = 30 c m ⇒ l = 9.46 × 10 15 × 10 × 1 . 22 × 600 × 10 - 9 0 . 3 = 2.30 × 10 11 m ⇒ 2.30 × 10 8 k m

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