Question

Define Principal focus of a concave mirror[ F] ?



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Answer 1

Answer:

The principal focus of a concave mirror is a point on its principal axis to which all the light rays which are parallel will converge after reflection from the concave mirror. ... After reflection from a concave mirror, the rays will converge to the focal point of the mirror which is denoted by point F in the image.

Explanation:

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Answer 2

When number of rays parallel to the principal axis falls on a concave mirror, the reflected rays meet /intersect at the point on the principal axis of the mirror.

This point is called as principal focus of a concave mirror.

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