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JEE Main & Advanced Physics Ray Optics Question Bank Total Internal Reflection

  • question_answer
    A fish looking up through the water sees the outside world contained in a circular horizon. If the refractive index of water is \[\frac{4}{3}\] and the fish is 12 cm below the surface, the radius of this circle in cm is [NCERT 1980; KCET 2002; AIEEE 2005; CPMT 2005]

    A)            \[36\sqrt{5}\]                      

    B)            \[4\sqrt{5}\]

    C)            \[36\sqrt{7}\]                      

    D)            \[36/\sqrt{7}\]

    Correct Answer: D

    Solution :

               \[r=\frac{3\,h}{\sqrt{7}}=\frac{3\times 12}{\sqrt{7}}=\frac{36}{\sqrt{7}}\].


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