Question

8cm distance to the principal axis find thr foucal length of mirror concave mirror foucl length​

Answer 1

Explanation:

Given, an object is placed on the principle axis of a concave mirror of focal length (f) 10cm at a distance (u) of 8cm from the pole.

∴u=−8cm and f=−10cm.

From the formula of mirror we get, 

f1=v1+u1

So, v1=f1−u1=−101−−81=401

Therefore, v=40cm, and the image is virtual as u<f.

Thus, the correct option is (A).