An electric bulb illuminates a plane surface. The intensity of illumination on the surface at a point 2m away from the bulb is `5 xx 10^(-4)` phot. The line joining the bulb to the point makes an angle of `60^(@)` with the normal to the surface. calculate the intensity of the bulb in candela ? (1 phot `= 1m//cm^(2))`.

Answer

40 cd