The heat of sun focussed by a convex lens on a piece of paper is capable of

Cooling the paper

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Just heating the paper

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Burning the paper

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Folding the paper

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Solution

The correct option is C Burning the paper
Sun has a huge amount of energy. When focussed with the help of a convex lens, it is capable of burning the paper.

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Q. You are provided with a printed piece of paper. Using this paper how will you differentiate between a convex lens and a 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

Q. We can burn a piece of paper by focusing the sun rays by using a particular type of lens. Name the type of lens used for the above purpose.

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The heat of sun focussed by a convex lens on a piece of paper is capable of

The correct option is C Burning the paperSun has a huge amount of energy. When focussed with the help of a convex lens, it is capable of burning the paper.

The correct option is C Burning the paper
Sun has a huge amount of energy. When focussed with the help of a convex lens, it is capable of burning the paper.