First slide

The optical instruments

Question

The length of a telescope is 36 cm. The focal lengths of its lenses can be

Moderate

A

30 cm, 6 cm
B

– 30 cm, – 6 cm
C

30 cm, – 6 cm
D

– 30 cm, 6 cm

Solution

$Total length L = f_{0} + f_{e} and both lenses are convex.$

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