Question

What is focal length of the concave mirror if you have an object 2.0 m from
the concave mirror, and the image is 4.0 m from the mirror?​

Answer 1

Answer:

1/v+ 1/u = 1/f

1/4+1/2 = 1/f

1+2/4 = 1/f

3/4 = 1/f

f = 4/3

Thanks