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A point object O is placed on the princi...

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

A

0

B

5 cm

C

2.5 cm

D

10 cm

Text Solution

Verified by Experts

The correct Answer is:
C
`Delta ABC and Delta CDE ` are similar

`(AB)/(BC) = (DE)/(CD) rArr (5)/(40) = (h)/(20) rArr h = 2.5 `cm.
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