First slide

Ray optics

Question

The focal length of the eye piece of an astronomical telescope is 5cm and its magnification for normal vision is 10. If the final image is formed at the least distance of distinct vision (25 cm), find the magnification

Moderate

A

16
B

12
C

15
D

14

Solution

$m = \frac{f_{0}}{f_{e}} (1 + \frac{f_{e}}{D}) = 10 (1 + \frac{5}{25}) = 12$

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