Question

what is meaning of focal lenth​

Answer 1

Answer:

• the distance between the centre of a lens or curved mirror and its focus.
• the equivalent distance in a compound lens or telescope.

Explanation:

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Answer 2

Answer:

For a thin lens in air, the focal length is the distance from the center of the lens to the principal foci (or focal points) of the lens. For a converging lens (for example a convex lens), the focal length is positive and is the distance at which a beam of collimated light will be focused to a single spot.