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A thin convergent lens is placed between...

A thin convergent lens is placed between an object and a screen whose positions are fixed. There are two positions of a lens at which sharp image of the object is formed on the screen. If the size of the images in the two cases are 2 mm and 4.5 mm then the size of the object should be:-

A

1mm

B

2mm

C

3mm

D

4mm

Text Solution

Verified by Experts

The correct Answer is:
C
Size of object `=sqrt(I_(1)I_(2)) = sqrt(2 xx 4.5) = 3mm`
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