What is the wavelength range of visible light?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 400 nm to 700 nm
NCERT (2026-27):
Visible Rays – “It is the most familiar form of electromagnetic waves. It is the part of the spectrum that is detected by the human eye. It runs from about 4 × 1014 Hz to about 7 × 1014 Hz or a wavelength range of about 700 – 400 nm.”