JEE Main & Advanced
Physics
Ray Optics
Question Bank
Photometry
question_answer
An electric bulb illuminates a plane surface. The intensity of illumination on the surface at a point 2m away from the bulb is \[5\times {{10}^{-4}}\] phot (lumen/cm2). The line joining the bulb to the point makes an angle of 60o with the normal to the surface. The intensity of the bulb in candela is [IIT-JEE 1980; CPMT 1991]