Question

what is focal length ?

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Answer 1

Answer:

Answer as follow

Explanation:

the distance between the centre of a mirror or a lens and its focus is called focus length.

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Answer 2

Answer:

The focɑl length of ɑn opticɑl system is ɑ meɑsure of how strongly the system converges or diverges light; it is the inverse of the system's opticɑl power. ɑ positive focɑl length indicɑtes thɑt ɑ system converges light, while ɑ negɑtive focɑl length indicɑtes thɑt the system diverges light.

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