Question

what is the fourmula of focal length?​

Answer 1

Answer:

♠The focal length of an optical system is a measure of how strongly the system converges or diverges light; it is the inverse of the system's optical power. A positive focal length indicates that a system converges light, while a negative focal length indicates that the system diverges light. ♠

Answer 2

Explanation:

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Focal length :- Distance between the pole & the radios of the mirror.

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f= focal length

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1/f= 1/v + 1/u

Here U = object distance & V = image distance

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