Question

principle of Focus is denoted by______?​

Answer 1

Answer:

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Principal focus of a convex lens is a point on its principal axis to which light rays parallel to the principal axis converge after refraction by the lens. It is usually represented by the letter 'F'. ... It is usually denoted by the letter 'F2'.

Answer 2

Answer:

Principal focus: A beam of light incident parallel to the principal axis, after reflection from the spherical mirror, either actually converges to or appears to diverge from a fixed point on the principal axis. The fixed point is called the 'Principal focus', denoted by letter 'F'.

Explanation:

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