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Question

What is principal axis?


  1. Straight line passing through Centre of curvature and any point on the mirror

  2. A line passing through focus and any point on the mirror 

  3. None of the above

  4. Straight line passing through Centre of curvature and pole


Solution

The correct option is D

Straight line passing through Centre of curvature and pole


It is a straight line which passes through the centre ,focus and pole of the mirror.

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