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Problem Faced by Surface Based Telescope and Telescopes in Space

Question

The focal length of eye lens and object lens of a telescope is 4 mm and 4 cm respectively. lf final image of an far object is at $\infty$ . Then the magnifying power and length of the tube are
10, 4.4 cm
4, 44 cm
44,10 cm
10,44 cm

A

44,10 cm

B

4, 44 cm

C

10,44 cm

D

10, 4.4 cm

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Solution

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Answer is A.

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