An astronomical telescope has objective and eye-piece lenses of powers 0 . 5 D and 20 D respectively. The magnifying power of the Telescope is

Question

An astronomical telescope has objective and eye-piece lenses of powers 0 . 5 D and 20 D respectively. The magnifying power of the Telescope is, 30, 10, 40, 20

MARKS App · Accepted Answer

Given , the power of objective lens, P 0 = 0.5 D The power of eye-piece lens, P e = 20 D The magnifying power of an astronomical telescope M = f 0 f e o r M = P e P 0 ∴ P = 1 f = 20 0.5 = 40

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