First slide

The optical instruments

Question

Four lenses of focal length + 15 cm, + 20cm, + 150cm and + 250 cm are available for making an astronomical telescope. To produce the largest magnification, the focal length of the eye-piece should be

Moderate

A

+ 15 cm
B

+ 20 cm
C

+150 cm
D

+ 250 cm

Solution

For largest magnification focal length of eye lens should be least.

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