Which of these can be used to burn a piece of paper?

Glass slab

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Convex lens

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Concave lens

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All of the above

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Solution

The correct option is B Convex lens
A convex lens converges all the parallel incident rays, whereas a concave lens diverges all the parallel incident rays.

Thus, a convex lens is used to burn objects by concentrating all the light energy at a particular point.

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Which of the following can be used to burn a small piece of paper with the help of sunlight?

Question 4 (a)

Collect pieces of different kinds of paper. Find out which of these can be recycled.

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