Question

Explain the working of an astronomical telescope using reflection of light.

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Answer 1

Answer:

A parallel beam of rays from an astronomical object is made to fall on the objective lens of the telescope. It forms a real, inverted and diminished image A′B′ of the object. ... Therefore, a highly magnified image of the object is formed at infinity.

Answer 2

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• The astronomical telescope consists of two lenses: objective and eyepiece.
• Objective has larger focal length and diameter to accommodate maximum amount of light coming from the far away objects.
• A parallel beam of rays from an astronomical object is made to fall on the objective lens of the telescope.
• It forms a real, inverted and diminished image A ′ B ′of the object.
• The eyepiece is so adjusted that A′B′ lies just at the focus of the eye piece.
• Therefore, a highly magnified image of the object is formed at infinity. The same has been shown in the figure below.

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