An astronomical telescope is focused on a distant star. If the distance between the objective lens and the eyepiece is 2.5 m and the power of the eyepiece is 4 D, then which of the following is correct?

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Mathematics · Optics

Verified Solution4 OptionsUpdated: October 2026👁️1 View

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The power of the objective lens is 0.44 D

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Answer 1

The magnifying power of the telescope is 90

Answer 2

The power of the objective lens is 0.44 D

Answer 3

The focal length of the objective is 75 cm

Answer 4

The magnifying power is 10

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