C. It is a point on the principal axis at which the rays parallel to the principal axis meet or appear to meet after reflection. For a concave mirror, it lies in front of the mirror and for a convex mirror, it lies behind the mirror. 1. What does it refer to? 2. Will it vary in distance from pole for different mirrors? 3. Draw its formation in both the cases i.e. concave and convex mirror. 4. Define focal plane and aperture of a mirror. 5. Where will the image be formed if any object is placed at this point in front of a concave mirror?
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