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

96 cm
B

98 cm
C

102 cm
D

104 cm

Solution

$By using m = \frac{f_{o}}{f_{e}} \Rightarrow f_{e} = \frac{100}{50} = 2 cm Also L = f_{0} - f_{e} = 100 - 2 = 98 cm$

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