First slide

The optical instruments

Question

A Gallilean telescope has objective and eye-piece of focal lengths 200 cm and 2 cm respectively. The magnifying power of the telescope for normal vision is

Moderate

A

90
B

100
C

108
D

198

Solution

For normal vision (relaxed eye), the image is formed at infinity. Hence the magnifying power of Gallilean telescope = $= \frac{f_{o}}{f_{e}} = \frac{200}{2} = 100$ .

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