Draw a schematic ray diagram of a reflecting telescope showing how rays coming from a distant object are received at the eyepiece. Write its two important advantages over a refracting telescope.

Solution

A reflecting telescope is as shown below:

In a reflecting telescope, an image is formed by reflection from a curved mirror. The image formed is then magnified by a secondary mirror.
Advantages of reflecting telescope over a refracting telescope are:
1. There is no chromatic aberration for reflecting telescopes as the objective is a mirror.
2. Spherical aberration is reduced in the case of reflecting telescopes by using mirror objective in the form of a paraboloid.

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Wave Optics

Draw a schematic ray diagram of a reflecting telescope showing how rays coming from a distant object are received at the eyepiece. Write its two important advantages over a refracting telescope.

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