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Refracting telescopes

A refracting telescope uses two converging lenses

The objective lens converges the rays from the object to form a real image

The eye lens acts as a magnifying glass on the real image to form a magnified image

If the object is assumed to be at infinity, then…

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Reflecting telescopes
A reflecting telescope uses a concave mirror and a converging lens

A parabolic concave mirror (the primary mirror) converges parallel rays from an object,
forming a real image and an eye lens magnifies the image as before

The focal point of the mirror (here the image is formed)…


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