Physics-
General
Easy

Question

A hollow sphere of glass as shown in figure has refractive index mu and has a small mark on its interior surface which is observed from a point outside the sphere on the side opposite to the center. The inner cavity is concentric with the external surface and thickness of glass is everywhere equal to the radius of the inner surface. What is the apparent shift in the position of mark?

  1. open parentheses fraction numerator 3 mu minus 1 over denominator mu plus 1 end fraction close parentheses R    
  2. open parentheses fraction numerator mu minus 1 over denominator 3 mu plus 1 end fraction close parentheses R    
  3. open parentheses fraction numerator mu minus 1 over denominator 3 mu minus 1 end fraction close parentheses R    
  4. open parentheses fraction numerator mu plus 1 over denominator 3 mu minus 1 end fraction close parentheses R    

The correct answer is: open parentheses fraction numerator mu minus 1 over denominator 3 mu minus 1 end fraction close parentheses R

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