Question

a what is the focal point of a lenses
b what is the focal length of a lenses​

Answer 1

Ans1)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.

Ans2)The focal length of the lens is the distance between the lens and the image sensor when the subject is in focus, usually stated in millimeters

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Answer 2

Answer:

Ans1)light rays incident towards either face of the lens and travelling 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.

Ans2)The lens's focal length is the distance between the lens and the image sensor when the subject is in focus, usually stated in millimetres.

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Explanation: