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JEE Main & Advanced Physics Ray Optics Question Bank Photometry

  • question_answer
    Light from a point source falls on a small area placed perpendicular to the incident light. If the area is rotated about the incident light by an angle of 60o, by what fraction will the illuminance change    

    A)            It will be doubled               

    B)            It will be halved

    C)            It will not change                

    D)            It will become one-fourth

    Correct Answer: C

    Solution :

               Rotation of area about incident light doesn?t change the inclination of the light ray on the area.


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