1. What is light?

2. Wave-particle duality
Light acts as both a wave and a particle
Light travels as a wave and transfers energy from one location to another
Particles of light are called photons.
They have no mass and they carry
specific amounts of energy.
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3. Light waves The speed of light is a constant in different mediums
Speed of light in a vacuum 𝑐=3.0× 𝑚/𝑠
So our familiar wave speed equation becomes…
𝒄=𝒇𝝀
Higher frequency means shorter wavelength and vice versa
Also, higher frequency waves means higher energy photons

4. Light waves Light waves are also called electromagnetic waves
Light travels as two perpendicular waves, one electric and one magnetic, with the same wavelength

5. Electromagnetic spectrum
Electromagnetic waves occur in a wide range of wavelengths (or frequencies) called a spectrum.
Only a very small portion of this spectrum is visible to humans.
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