Question

17) A point source is kept in front of a convex mirror at a certain distance of 30
cm. The focal length of the mirror is 15 cm. Then the position of the image is​

Answer 1

Object distance u=−40 cm
Focal length f=40 cm
Using mirror formula :
v
1
​
+
u
1
​
=
f
1
​

Or
v
1
​
+
(−40)
1
​
=
(40)
1
​

We get v=20 cm