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You are given the following 3 lenses. Two construct an astronomical telescope which one will you used as eyepiece and which one as objective?
Lens Aperture (cm) Power (D)
L1 8 3
L2 1 10
L3 1 6

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L3, L1

L1, L2

L2, L1

L2, L3

answer is B.

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Detailed Solution

The objective should have large aperture and large focal length while eyepiece should have small aperture and small focal length.

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