1. Light

2. What is Light?
Light is composed of particles called photons which are massless bundles of concentrated electromagnetic energy and the travel in waves. Transverse Waves

3. Light travels in straight lines:
Properties of Light
Light travels in straight lines:
Laser

4. Light travels VERY FAST – around 300,000 kilometres per second.
At this speed it can go around the world 8 times in one second.
A light-year is the distance light travels in one year and is a unit of measure.

5. Light travels much faster than sound. For example:
Thunder and lightning start at the same time, but we will see the lightning first.
2) When a starting pistol is fired we see the smoke first and then hear the bang.

6. Electromagnetic
Electromagnetic waves- is energy traveling in a wave that is partially electric and partially magnetic.
Electromagnetic Spectrum- all the electromagnetic waves that reach earth.

7. Electromagnetic Spectrum
Radio, microwaves, infrared, visible light, ultraviolet, x-rays and gamma rays
Organized from longest wavelength to shortest
We have various uses for each type of wave

8. Color
White light is not a single color; it is made up of a mixture of the seven colors of the rainbow.
We can demonstrate this by splitting white light with a prism:
This is how rainbows are formed: sunlight is “split up” by raindrops.

9. The colors of the rainbow: (ROY G BIV)
Red
Orange
Yellow
Green
Blue
Indigo
Violet

10. Objects and Light
Transparent Objects- visible light can pass through them. Example: Clear glass
Opaque Objects- No light passes through them . Example wood, bricks etc.
Translucent Object- some light passed through . Example: Frosted Glass

11. Shadows Shadows are places where light is “blocked”: Rays of light
A shadow is formed where light can’t reach.
The larger the light source the larger the shadow.
Shadows are places where light is “blocked”:
Rays of light

12. Polarization
Light waves are transverse and that means they can be polarized-when waves travel in one direction.
Polarized lenses filter light and caused it to be polarized reducing glare.