Solution:For convex lens ,Focal length, f = + 20 cm
Object distance, u= -60 cm
Now, using the lens formula,we have
1/v - 1/u - 1/f
Putting in the values, we get image distance, v = + 30 cm
Now, for convex mirror
Object distance, u
= + (30 - 15) cm = 15 cm
Focal length, f = + 20/2 cm
= + 10 cm
Now, using the mirror formula we have Putting all the values, we get Image distance, v = + 30 cm