When sunlight is concentrated on a piece of paper by a spherical mirror or lens, then a hole can be burnt in it. For doing this, the paper must be placed at the focus of :
(a) either a convex mirror or convex lens
(b) either a concave mirror or concave lens
(c) either a concave mirror or convex lens
(d) either a convex mirror or concave lens

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Solution

(c) either a concave mirror or convex lens

Concave mirror focuses the parallel sun rays at focal point of the mirror.

So with a small concave mirror we can heat up and burn a paper.

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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 spherical mirror and a spherical lens each have a focal length of, -15 cm. The mirror and the lens are likely to be : (a) both concave. (b) both convex. (c) the mirror is concave but the lens is convex. (d) the mirror is convex but the lens is concave.

Q. The magnification produced by a spherical mirror and a spherical lens is + 0.8.
(a) The mirror and lens are both convex
(b) The mirror and lens are both concave
(c) The mirror is concave but the lens is convex
(d) The mirror is convex but the lens is concave

Q. What is the nature (converging or diverging) of concave lens ,convex lens and concave mirror, convex mirror

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(c) either a concave mirror or convex lens Concave mirror focuses the parallel sun rays at focal point of the mirror. So with a small concave mirror we can heat up and burn a paper.

(c) either a concave mirror or convex lens

Concave mirror focuses the parallel sun rays at focal point of the mirror.

So with a small concave mirror we can heat up and burn a paper.