Question

what is specturm of light?

Answer 1

Light spectrum can mean the visible spectrum, the range of wavelengths of electromagnetic radiation which our eyes are sensitive to … or it can mean a plot (or chart or graph) of the intensity of light vs its wavelength (or, sometimes, its frequency).

Answer 2

When white light passes through prism it splits into seven colurs namely ,violet, indigo, blue, green, yellow, orange and red. (VIBGYOR) and violet colour towards the base of a prism. The seven color band is called spectrum of light.

(Hope it helps)