Multiple choice

What do you mean by 1 dioptre of power of a lens?

  1. The reciprocal of its focal length

  2. The separation between the pole and the centre of curvature

  3. The ratio of the height of image to the height of the object

  4. Imaginary straight line passing through the two centres of curvature

  5. The effective diameter of the circular outline of a spherical lens
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A Correct answer
Explanation

Power of a lens is defined as the reciprocal of its focal length. If P is the power of a lens of focal length f in metres, then p = 1/f.

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