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

  • question_answer
    r and r' denote the angles inside an equilateral prism, as usual, in degrees. Consider that during some time interval from \[t=0\] to\[t=t\], \[r'\] varies with time as \[r'=10+{{t}^{2}}\]. During this time r will vary as (assume that r and r' are in degree)

    A) \[50-{{t}^{2}}\]

    B) \[50+{{t}^{2}}\]

    C) \[60-{{t}^{2}}\]

    D) \[60+{{t}^{2}}\]

    Correct Answer: A

    Solution :

    [a] In a prism: \[r+r'=A\Rightarrow r=A-r'\] \[\therefore r=60{}^\circ -\left( 10+{{t}^{2}} \right)=50-{{t}^{2}}\]


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