Orange, green, and indigo lights are part of the visible spectrum of light.
What is the correct order of these colours from shortest to longest wavelength?
orange →\rightarrow→ green →\rightarrow→ indigo
indigo →\rightarrow→ green →\rightarrow→ orange
green →\rightarrow→ indigo →\rightarrow→ orange
indigo →\rightarrow→ orange →\rightarrow→ green
12 exam-style questions on CIE IGCSE Physics 3.2.4 Dispersion of light. Each one has a worked solution and a mark scheme showing where the marks go.