A point object is placed on the optic axis of a convex lens of focal length `f` at a distance of `2f` to the left of it. the diameter of the lens is `'d'` . An eye is placed at a distance of `3f` to the right of the lens and a distance `h` below the optic axis. The maximum value of `h` to see the image is

Options

A. `d`
B. `d//2`
C. `d//3`
D. `d//4`

Answer

D

Explanation

From two similar triangles
`(h)/(d//2)=(f)/(2f)`
or `(2h)/(d)=(1)/(2)` or `h=(d)/(2)`