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NDA 2 2024 GAT, question 89

Topic: Physics

Q89

A point object is placed at the centre of curvature of a spherical concave mirror. Which one among the following would be the correct location of image formed ?

  1. (a) At infinity
  2. (b) At the centre of curvatureCorrect answer
  3. (c) At the focal point
  4. (d) Between the focal point and the centre of curvature

Solution.

Answer: (b) At the centre of curvature

  1. For a concave mirror, an object at the centre of curvature, 2f, forms a real inverted image at 2f of the same size.
  2. In the mirror equation, equal object and image distances give 2/u=1/f, hence u=2f.