An astronomical telescope has objective and eyepiece of focal lengths 40 cm and 4 cm respectively. To view an object 200 cm away from the objective, at what distance the lenses must be separated (in cm )?

Question

An astronomical telescope has objective and eyepiece of focal lengths 40 cm and 4 cm respectively. To view an object 200 cm away from the objective, at what distance the lenses must be separated (in cm )?,

MARKS App · Accepted Answer

1 V - 1 - 200 = 1 40 1 V = 5 5 1 40 - 1 200 = 5 200 - 1 200 1 V = 4 200 = 1 50 V = 50 ∴ d = 50 + 4 = 54 c m

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