First slide

Ray optics

Question

Magnification produced by an astronomical telescope for normal vision is 20. Length of the telescope tube for normal vision is 105cm. Then focal length of the objective is

Moderate

A

60 cm
B

120 cm
C

100 cm
D

80 cm

Solution

$\frac{f_{o}}{f_{e}} = 2 θ . ... (1) and f_{o} + f_{e} = L = 105 . .... (2) Solving, f_{e} = 5 cm f_{o} = 100 cm$

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