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Question

When an object lies at the focus of a concave mirror, then the position of the image formed and its magnification are

A
pole and unity
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B
infinity and focus
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C
inifity and inifity
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D
centre of curvature and unity
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Solution

The correct option is A pole and unity

  1. Object between Principal Focus (F) and Pole (P): When the object is placed between principal focus and pole of a concave mirror, an enlarged, virtual and erect image is formed behind the mirror.
  2. when an object is placed at the principal focus of a concave mirror, it produces real, inverted, highly enlarged image at infinity. But practically, no image is formed, as the light rays passing through the principal focus travel parallel to each other and never meet


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