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An electric bulb illuminates a plane surface The intensity of illumination on the surface at...

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Physics

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An electric bulb illuminates a plane surface The intensity of illumination on the surface at a point 2 m away from the bulb is 5x 10 phot lumen sq cm The line joining the bulb to the point makes an angle of 60 with the normal to the surface The intensity of the bulb in candela is a 40 3 c 20 b 40 d 40 10 4 IIT 1980

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