Question

a student obtains a sharp image of the distant window (w) of the school laboratory on the screen( s) using the given concave mirror( m) to determine it's focal length.
which of the following distance should he measure to get the focal length of the mirror? ​

Answer 1

MS is the focal length

because, focal length is the distance between screen and mirror

Answer 2

Hey mate,

MS would be the answer because focal length is described as the distance between pole and principal focus of a mirror. Here, the screen acts as the focus.

Hope this helps ;)please mark it as brainliest....