As per your syllabus, the unit of SOLID ANGLE in SI is which?
- Square radian
- Radian (rad)
- Steradian (sr)
- Lumen (lm)
Show answer and solution
Correct answer: C. Steradian (sr)
syllabus Fig 1.1(b): solid angle = area/radius² → sr.
Dimensionless, supplementary SI unit.