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.

Q. The magnification produced by a spherical lens and a spherical mirror is + 2.0.
(a) The lens and mirror are both concave
(b) The lens and mirror are both convex
(c) The lens is convex but the mirror is concave
(d) The lens is concave but the mirror is convex

The image formed by a spherical mirror is virtual. The mirror will be : (a) concave (b) convex , (c) either concave or convex (d) metallic

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.

(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.