• The electromagnetic spectrum is the range of all types of electromagnetic radiation, or different types of light, designated by wavelengths.

Visible light

• Visible light is electromagnetic radiation that the unaided human eye can see.
• It has wavelengths between 380 nanometers (nm) and 700 nm.
• The different colors that make up white light have different wavelengths (all within the range of 380-700nm)
• The color violet has the shortest wavelength of 380nm.
• The color red has the longest wavelength of 700 nm.
• Sources of visible light include the sun, the stars, and lightbulbs (such as fluorescent and LED bulbs).

Review

• Q: What is the definition of visible light?
• A: Electromagnetic radiation with wavelengths between 380-700nm.