2. Questions Bank
  3. JEE Main & Advanced
  4. Physics
  5. Ray Optics

JEE Main & Advanced Physics Ray Optics Question Bank Photometry

  • question_answer
    The intensity of direct sunlight on a surface normal to the rays is \[{{I}_{0}}\]. What is the intensity of direct sunlight on a surface, whose normal makes an angle of 60o with the rays of the sun                                    [CPMT 1981]

    A)            \[{{I}_{0}}\]                          

    B)            \[{{I}_{0}}\left( \frac{\sqrt{3}}{2} \right)\]

    C)            \[\frac{{{I}_{0}}}{2}\]           

    D)            \[2{{I}_{0}}\]

    Correct Answer: C

    Solution :

               \[{{I}_{\theta }}={{I}_{o}}\cos \theta \]\[={{I}_{o}}\cos {{60}^{o}}\]\[=\frac{{{I}_{o}}}{2}\]


You need to login to perform this action.
You will be redirected in 3 sec spinner