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

  • question_answer
    A fish is a little away below the surface of a lake. If the critical angle is 49°, then the fish could see things above the water surface within an angular range of \[{{\theta }^{o}}\] where [MP PMT 1986]

    A)            \[\theta ={{49}^{o}}\]

    B)            \[\theta ={{90}^{o}}\]

    C)            \[\theta ={{98}^{o}}\]

    D)            \[\theta =24\frac{{{1}^{o}}}{2}\]

    Correct Answer: C

    Solution :

               From figure given in question \[\theta =2c=98{}^\circ .\]


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