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Solution


Q.

A light ray enters from medium A to medium B as shown in figure. The refractive index of medium B relative to A will be:
1 greater than unity  
2 less than unity  
3 equal to unity  
4 zero  

Ans.

(1)

As the light ray when travelled from medium A to medium B, then they bend towards the normal which means that medium B has higher refractive index and less speed of light with respect to medium A. So, refractive index of medium B w.r.t. medium A will be greater than unity.