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Combinations of Lenses & Mirrors

The magnifyin...

Question

The magnifying power of a telescope is 9. When it is adjusted for parallel rays, the distance between the objective and eyepiece is found to be 20 cm. The focal lengths of lenses are:

A

18 cm, 2 cm

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B

10 cm, 10 cm

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C

5 cm, 5 cm

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D

11 cm, 9 cm

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Solution

The correct option is A
18 cm, 2 cm

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