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RAJASTHAN PMT Rajasthan - PMT Solved Paper-2000

  • question_answer
    If the sun rays are incidenting at \[60{}^\circ \] angle and intensity is \[I\]. If sun rays are made incident at \[30{}^\circ \] angle, then what will be the intensity?

    A)  \[\frac{I}{\sqrt{3}}\]                     

    B)         \[\sqrt{3}I\]

    C)   \[3I\]                                  

    D)         \[\frac{I}{3}\]

    Correct Answer: B

    Solution :

    Ratio of intensities \[\frac{{{I}_{1}}}{{{I}_{2}}}=\frac{\cos \,{{\theta }_{1}}}{\cos {{\theta }_{2}}}=\frac{\cos \,60}{\cos \,30}\] \[{{I}_{2}}=\sqrt{3}{{I}_{1}}\]


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