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Q.

A point object (inside a glass slab) when viewed from two opposite faces of a plane glass slab appears at distance of 9cm and 5cm respectively from the surfaces. The thickness of slab is _____ cm

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answer is 21.

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Detailed Solution

Apparent depth = real depth  refractive index  

Thickness of glass slab = L

Let x be the actual distance from first face

 9=xμ⇒x=9μ -1

From 2nd face 5=L−xμ

⇒L=14μ⇒L=21cm

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