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  4. If x1 be the size of the magnified image and x2 the size of the diminished image in Lens Displacement Method, then the size of the object is

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Q. If $x_1$ be the size of the magnified image and $x_2$ the size of the diminished image in Lens Displacement Method, then the size of the object is

WBJEEWBJEE 2010Ray Optics and Optical Instruments

Solution:

The size of the object in accordance with the Fresnel's displacement law is given by $\sqrt{x_{1} \,x_{2}}$.