Ordinary light from a filament lamp is incoherent because:

  1. it has only one frequency
  2. it is polarized
  3. atoms emit light randomly and independently
  4. it is very weak
Answer

C) atoms emit light randomly and independently

Short, random wave trains. SLO P-11-D-14 · Understanding

Physics MCQ · More Superposition, Stationary Waves and Beats MCQs · Practise