1. Properties of light

2. Learning goals We are learning the different properties of light.
We are learning about the electromagnetic spectrum.

3. What is Light?
Light: A stream of photons each travelling with wave-like properties at the speed of light.
A photon is the smallest quantity of energy which can be transported.

5. Properties of Light
Rectilinear Propagation: Travels in straight lines in the same medium.
Light does not need a medium (substance) to travel
Unlike sound, water waves
In vacuum or air, speed of light is constant
c = 3.0 x 108 m/s
Visible light is a small portion of the electromagnetic spectrum.

6. Electromagnetic Spectrum

7. Visible Light Spectrum
White light is made up of:
Red, orange, yellow, green, blue, indigo and violet.
Or remember… ROY G BIV

9. Prism Demonstration A triangular prism slows down the speed of light
Each colour is slowed differently because of differing energy levels - this separates white light into different colours!

10. Learning goals We are learning the different properties of light.
We are learning about the electromagnetic spectrum.