Question

what is the formula for mirror​

Answer 1

1/f=1/v+1/u is the mirror equation, where f is focal length, u is the object distance measured from principal, and v is the image distance measured from principal. You have to use this equation with proper sign convention as stated in the question.

Answer 2

$\huge\bold\red{Formula}$

☯$\frac{1}{f } = \frac{1}{v} + \frac{1}{u}$

☯$m = \frac{ - v}{u}$

❤..Hope it helps you..❤