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In displacement method, the lengths of images in the two positions of the lens betwent the object and the screen are 9 cm and 4 cm respectively. The l

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in Physics by (84.6k points)
In displacement method, the lengths of images in the two positions of the lens betwent the object and the screen are 9 cm and 4 cm respectively. The length of the object must be
A. 6.25 cm
B. 1.5 cm
C. 6 cm
D. 36 cm
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1 Answer

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by (87.2k points)
Correct Answer - C
`O=sqrt(I_1I_2)=sqrt(9xx4)=6cm`
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