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JEE Main & Advanced Physics Ray Optics Question Bank Self Evaluation Test - Ray Optics and Optical Instruments

  • question_answer
    Two beams of red and violet colors are made to pass separately through a prism (angle of the prism is \[60{}^\circ \]). In the position of minimum deviation, the angle of refraction will be

    A) \[30{}^\circ \] for both the colors

    B) greater for the violet color

    C) greater for the red color

    D) equal but not \[30{}^\circ \] for both the colors.

    Correct Answer: A

    Solution :

    [a] For minimum deviation the ray in the prism is parallel to the base of the prism. This condition does not depend on the color (or wave length) of incident radiation. So in both the cases, by geometry, \[r=30{}^\circ .\]So [a] is correct option.


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