Why is a convex lens called a converging lens and a concave lens a diverging lens? [3 MARKS]

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Solution

Converging property with diagram: 1.5 Marks
Diverging property with diagram: 1.5 Marks

If parallel rays of light fall on a convex lens they converge when passing through and meet at a point on the other side. That's why the convex lens is known as a converging lens.

If parallel rays of light fall on a concave lens they diverge as they pass through the lens never to meet at a point. That's why we call them diverging lenses.

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Why concave lens diverge and convex lens converge light rays?

Q. State whether true or false:

A convex lens has a divergent action and a concave lens has a convergent action.

(a) An object is placed 10 cm from a lens of focal length 5 cm. Draw the ray diagrams to show the formation of image if the lens is (i) converging, and (ii) diverging. (b) State one practical use each of convex mirror, concave mirror, convex lens and concave lens.

What is the focal length of a convex lens of focal length 30 cm in contact with a concave lens of focal length 20 cm? Is the system a converging or a diverging lens? Ignore thickness of the lenses.

(a) Explain with the help of a diagram, why the concave lens is also called a diverging lens. (b) Define the principal focus of a concave lens.

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