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Q.

One face of a rectangular glass plate,  6 cm thick,  is silvered. An object held 8 cm in front of the first face forms an image 12 cm behind the silvered face. The refractive index of the glass is

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answer is 0001.2.

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Detailed Solution

Thickness of glass plate t=6 cm ;             Distance of the object u=8 cm ;            And distance of the image v=12 cm            Let x = Apparent position of the silvered surface in cmSince the image is formed due to reflection at the silvered face and by the property of mirror image.Distance of object from the mirror = Distance of image from the mirrorOr, x+8=12+6−x⇒x=5 cm            Therefore, refractive index of glass = Real depthApparent depth=65=1.2
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