Question

While determining focal length of given concave mirror by focusing a distant object on the screen you always get in the begi nnind a blurred image on the screen . In order to obtain a sharp image on the screen in which direction we have to move the mirror?

Answer 1

There is no specefc dirction to move ,you have move forward toward and backward (away) from the distance and adjust untill you get the sharp imgae
first you move it toward object,,try to get sharp ,if got sharp stop there ,
If not try moving it untill we get good sharp image