Question

what is a focal length...... ​

Answer 1

Hi buddy

Here is your 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

Hope it help

Please mark me please

#sibi ❤️

Answer 2

Answer:

heyya here's answer.

The distance optical centre and focus is known as focal length. It is denoted by 'f' ..