Question

the image formed by a convex mirror of a focal length 30 cm is a quarter of the object.what is the distance of the object from the mirror​

Answer 1

Answer:

Explanation:

Here, f=30cm,m=14,u=?

As m=−vu=14,v=−u4

As 1/v+1/u=1f,−4/u+1/u=1/30 or −3/u=1/30 or u= -90.