Question

A 5cm tall object is placed on the principal axis of a convex lens of focal length 50cm at a distance of 40cm from it. Use the lens formula to find the nature and position of the image.

Answer 1

Answer:

f=50cm ,u=50+40=90cm ,then v=?

Explanation:

1/f=1/v+1/u1/

1/v=1/f-1/u

1/v=-1/50-(-1/90)

1/v=-1/50+1/90

1/v=-40/450

so, Image is behind the convex mirror

hi/hii=-v/u

hi/5=-40/450/90

hi=40cm