Q. If $I_{1}$ and $I_{2}$ be the size of the images respectively for the two positions of lens in the displacement method, then the size of the object is given by
A) $I_{1}/I_{2}$
B) $I_{1} \times I_{2}$
C) $\sqrt{I_{1} \times I_{2}}$
D) $\sqrt{I_{1}/I_{2}}$
Explanation
(c) $\frac{I_{1}}{O} = \frac{v}{u}$ and $\frac{I_{2}}{O} = \frac{u}{v} \Rightarrow O^{2} = I_{1}I_{2}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.