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JEE Main & Advanced Physics Question Bank Prism Theory and Dispersion of Light

  • question_answer
    A given ray of light suffers minimum deviation in an equilateral prism P. Additional prisms Q and R of identical shape and material are now added to P as shown in the figure.  The ray will suffer   [IIT-JEE (Screening) 2001; KCET 2003]

    A)            Greater deviation

    B)            Same deviation

    C)            No deviation

    D)            Total internal reflection

    Correct Answer: B

    Solution :

               As the prisms Q and R are of the same material and have identical shape they combine to form a slab with parallel faces. Such a slab does not cause any deviation.


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