First slide

Ray optics

Question

The difference in maximum and minimum magnification of an astronomical telescope is 2.4 then focal length of the objective is

Moderate

A

78 cm
B

45 cm
C

48 cm
D

60 cm

Solution

$m a x i m u m m a g n i f i c a t i o n i s \frac{f_{0}}{f_{e}} (1 + \frac{f_{e}}{D}) a n d m i n i m u m m a g n i f i c a t i o n i s \frac{f_{0}}{f_{e}} t h e i r d i f f e r e n c e i s \frac{f_{0}}{D} = 2.4 f_{0} i s 60$

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