Electromagnetic Waves and Wave Optics: EM Spectrum — Wavelength of Visible MCQ

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EM Spectrum — Wavelength of VisibleHardQuestion 20198

Question

The visible spectrum spans approximately:

A
10 nm to 100 nm
B
400 nm to 700 nm
Correct
C
1 μm to 10 μm
D
1 mm to 1 cm

Correct answer

400 nm to 700 nm

Explanation

Visible light: violet (~400 nm) to red (~700 nm). Memorise VIBGYOR: Violet, Indigo, Blue, Green, Yellow, Orange, Red — increasing wavelength. Below 400 nm is UV; above 700 nm is IR.

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