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

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Solution

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) $N e w t o n i a n$ telescope(Refer Fig.1)
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) $C a s s e g r a i n$ telescope (Refer Fig. 2)
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.

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Question 4

You are provided with a concave mirror, a convex mirror, a concave lens and a convex lens. To obtain an enlarged image of an object you can use either

(a) concave mirror or convex mirror.

(b) concave mirror or convex lens.

(d) concave lens or convex lens.

Question 7

You are provided with a convex mirror, a concave mirror, a convex lens and a concave lens. You can get an inverted image from

(a) both concave lens and convex lens.

(b) both concave mirror and convex mirror.

(d) Both convex mirror and concave lens.

A real and enlarged image can be obtained by using a :

(a) convex mirror

(b) plane mirror

(d) either convex or plane mirror.

A virtual image larger than the object can be produced by a

(i) concave lens

(ii) concave mirror

(iii) convex mirror

(iv) plane mirror

Which of the following can make a parallel beam (a) concave mirror as well as concave lens (b) convex mirror as well as convex lens (c) concave mirror as well as convex lens (d) convex mirror as well as concave lens

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