Question

Suppose an object is placed u cm in front of a spherical mirror of focal length f such that the image is formed v cm from the mirror, then u, v and f are related by the equation; 1/f= 1/u + 1/v. This equation is referred to as the mirror formula. The formula holds for both concave and convex mirrors.​

Answer 1

★Answer

solution

u=30cm, f= 15cm, ho=4cm

1/v=1/f-1/u

= 1/15 – 1/30 =1/30

v =30cm

Also, m=v/u =hi/ho

Thus, hi=(30cm x 4cm)/30cm =4cm.

Thus the image formed is real and same size as the object.