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JIPMER Jipmer Medical Solved Paper-2001

  • question_answer
    A point source of light is placed 4 m below the surface of water of refractive index is 5/3. The minimum diameter of a disc which should be placed over the source on the surface of water to cut-off all light coming out of water is:

    A)  6m                                        

    B)  3 m                       

    C)  4m                        

    D)         2 m

    Correct Answer: A

    Solution :

    Given, \[\sin \,i=\frac{1}{\mu }=\frac{3}{5},\] so \[\tan i=\frac{3}{4}=\frac{r}{4}\] it gives r = 3 m so, the diameter = 6 m


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