A point object O is placed on the principal axis of a convex lens of local length `f=20` cm at a distance of 40 cm to the left of it. The diameter of the lensis 10 cm. An eye is placed 60 cm to right of thelens and a distance h belwo the principal axis. The maximum vlaue of h to see the image is

Answer

C

Explanation

For the lens, f=15cm, u=-30cm
From lens formula
`1/v-1/u=1/f`
`rarr 1/v=1/f+1/u`
`=1/15-1/30=1/30`
`rarr v=30cm`
`rarr /_\F=(1-1/1.5)1`
`[sinceu_2=1.5 and t=1cm]`
=1-2/3=1/3=0.38cm`
The image will be formed at 30+0.33=30.33 cm from the lens on right side.