Question

3 a) What is the focal point of a lens? b) What is the focal length of a lens?​

Answer 1

Answer:

Therefore, the distance or the length of the pole of the lens to its focal point is called its Focal length. It is denoted by f. Based on the position of the focal point near a spherical lens, the focal length is of two types: Negative Focal length and Positive Focal length.

Explanation:

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Answer 2

As mentioned above, light rays incident towards either face of the lens and traveling parallel to the principal axis will either converge or diverge. If the light rays converge (as in a converging lens), then they will converge to a point. This point is known as the focal point of the converging lens.