The amount of light flux produced by an isotropic source of 2 candela is -
- A2π lumen
- B4π lumens
- C8π lumens
- DMore than one of the above
- ENone of the above
Show answer and explanation
Correct answer: (c) 8π lumens
Explanation
A point source that shines equally in all directions sends its light into a full sphere, which is 4π steradians. Its total luminous flux is F = 4πI.
For I = 2 candela: F = 4π × 2 = 8π lumens.