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JEE Main & Advanced Physics Ray Optics Question Bank Critical Thinking

  • question_answer
    A prism having an apex angle 4o and refraction index 1.5 is located in front of a vertical plane mirror as shown in figure. Through what total angle is the ray deviated after reflection from the mirror

    A)            176o

    B)            4o

    C)            178o

    D)            2o  

    Correct Answer: C

    Solution :

               \[{{\delta }_{\Pr ism}}=(\mu -1)A=(1.5-1){{4}^{o}}={{2}^{o}}\]                    \[\therefore \]\[{{\delta }_{Total}}={{\delta }_{\Pr ism}}+{{\delta }_{Mirror}}\]                    \[=(\mu -1)A+(180-2i)={{2}^{o}}+(180-2\times 2)={{178}^{o}}\]


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