First slide

The optical instruments

Question

A Galileo telescope has an objective of focal length 100 cm and magnifying power 50. The distance between the two lenses in normal adjustment will be

Moderate

A

98 cm
B

100 cm
C

150 cm
D

200 cm

Solution

$m = \frac{f_{o}}{f_{e}} \Rightarrow \frac{100}{f_{e}} = 50 \Rightarrow f_{e} = 2 cm Normal distance f_{o} - f_{e} = 100 - 2 = 98 cm .$

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