Sign Conventions For Reflections By Spherical Mirrors.

Q28. What are sign conventions for reflections by spherical mirrors.
Ans. The set of rules to use positive or negative signs with the values while doing any problem in optics is called sign conventions.
They are:

  1. The object is placed on to the left of the mirror so that the incident light moves left to right.
  2. All measurements are to be made from the pole of the mirror.
  3. The distance is measured in the direction of the incident light will be taken as positive and opposite directions will be taken as negative.
  4. All Measurements of heights above the principal axis are to be taken as positive.

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