

InterviewSolution
Saved Bookmarks
1. |
An electric bulb illuminates a plane surface. The intensity of illumination on the surface at a point 2 m away from the bulb is `5 xx 10^(-4)` phot `("lumen"//cm^(2))`. 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 isA. `40 sqrt(3)`B. 40C. 20D. `40 xx 10^(-4)` |
Answer» Correct Answer - b | |