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Uttarakhand PMT Uttarakhand PMT Solved Paper-2005

  • question_answer
    If the refractive angles of the prisms made of crown glass are\[10{}^\circ \]and\[20{}^\circ \]respectively. Then the ratio of their colour deviation power will be:

    A)  4 :1               

    B)  3 :1

    C)  2 :1               

    D)  1:1

    Correct Answer: D

    Solution :

     Here: Refractive angle of first prism having \[(R.I.\,\mu =10{}^\circ )\] Refractive angle of second prism having \[(R.I.\,\mu =20{}^\circ )\] As the colour deviation power depends upon the material of prisms (refractive index) and not on refracting angles. As the both of the prismss are made of same material. Hence, the ratio of deviation power will become same so, that the ratio of deviation powers will be 1:1.


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