Question

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What is the formula to find focal length of mirror?​

Answer 1

We can find the focal length of a mirror by mirrors formula,

Which is,

1/v + 1/u = 1/f

Where,

v = image distance from the mirror,

u = object distance from the mirror,

f = focal length of the mirror

Usually in the physic's numerical either of the three values two particular values are already given in the question and you gotta find the remaining one.