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Question

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


Solution

(c) either a concave mirror or convex lens
  1. Concave mirror focuses the parallel sun rays at focal point of the mirror.
  2. So with a small concave mirror we can heat up and burn a paper.

Physics
Science for Tenth Class - Part I - Physics
Standard X

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