Which lens should be used to burn a piece of paper?
A
Glass slab
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B
Biconvex lens
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C
Biconcave lens
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D
Plano-concave lens
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Solution
The correct option is B 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.