If ${I_1}$ and ${I_2}$ are the sizes of the images for the two positions of the 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}} $
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