Question

Magnification produced by convex lens is 3 when an object is at 10cm what is the position of the image? ​

Answer 1

Explanation:

It is given that a convex lens of focal length

f=+20cm

m=+2

∵m=uv

v=2u..........(1)

Using lens formula

v1−u1=f1

2u1−u1=201

u=−10cm

Hence, object is placed at a distance of 10 cm in front of lens.