You are provided with the printed piece of paper using this paper, how will you differentiate between a convex and concave lens?

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Solution

Concave lens
Convex lens
The lens is first placed on a sheet of printed paper. Then we slowly raise it. If the words on the printed paper become smaller when viewed through the lens, it is a concave lens. The lens is first placed on a sheet of printed paper. Then we slowly raise it. If the words on the printed paper expand larger when viewed through the lens, it is a convex lens.
A concave lens always results in a smaller image. A convex lens results in a larger image.

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How will you differentiate between a convex and a concave lens by looking at (i) a distant object, (ii) a printed page ?

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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.

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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Concave lens	Convex lens
The lens is first placed on a sheet of printed paper. Then we slowly raise it. If the words on the printed paper become smaller when viewed through the lens, it is a concave lens.	The lens is first placed on a sheet of printed paper. Then we slowly raise it. If the words on the printed paper expand larger when viewed through the lens, it is a convex lens.
A concave lens always results in a smaller image.	A convex lens results in a larger image.