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Question: The magnifying power of an astronomical telescope is 8 and the distance between the two lenses is 54...

The magnifying power of an astronomical telescope is 8 and the distance between the two lenses is 54 cm. The focal length of eye lens and objective lens will be respectively –

A

6 cm and 48 cm

B

48 cm and 6 cm

C

8 cm and 64 cm

D

64 cm and 8 cm

Answer

48 cm and 6 cm

Explanation

Solution

M = – 8 = – Ž fo = 8fe, L = fo + fe = 54

fe = 6 cm, fo = 48 cm