Question

Which type of telescopes can be made using a concave mirror, convex mirror, plane mirror, and a lens? Draw diagrams of these telescopes.

Answer 1

In a reflecting telescope, instead of a convex objective lens, a concave mirror is used to collect parallel rays from the object and form an image at the focal point. Then the convex eyepiece lens is used to magnify this image for the viewer.

Concave mirrors focus light at a focal point using reflection, not refraction.

Mirrors are used instead of lenses in large, professional telescopes. This is because an objective lens can have a maximum diameter of approximately 1 metre before it begins to sag, whereas a mirror of several metres in diameter can be used.

Answer 2

Answer:

Reflecting types of telescopes can be made using a concave mirror, convex mirror, plane mirror and a lens. Reflecting type of telescopes is mainly of two types:

(a) Newtonian telescope

Light rays coming from a heavenly body (distant object) get reflected by the concave mirror. Before the reflected rays converge at the focus of the concave mirror, it is again reflected by the plane mirror as shown. As a result, the rays pass through the eyepiece and we get a magnified image of the body.

(b) Cassegrain telescope

In this telescope, the light rays after reflection from the concave mirror, are reflected back towards it by a small convex mirror. Then the rays pass through the eyepiece placed at the back of the concave mirror as shown. The eyepiece produces a magnified image of the source.

Explanation:

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