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Question

Which lens should be used to burn a piece of paper?
  1. Glass slab
  2. Biconvex lens
  3. Biconcave lens
  4. Plano-concave lens


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.

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