Which lens should be used to burn a piece of paper?

Glass slab

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Plano-concave lens

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Biconcave lens

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Biconvex lens

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Solution

The correct option is D Biconvex lens
A Biconvex lens can converge all the incident rays coming from infinity at the focus. Thus, the piece of paper needs to be placed at the focus to burn it.

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Similar questions

We can burn a piece of paper by focussing the sunrays by using a particular type of lens. Name the type of lens used for this purpose.

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