Light presentation

Light and Sound ,[object Object],[object Object],[object Object],[object Object],[object Object]

Part 1 – Properties of Light ,[object Object],Laser

[object Object],At this speed it can go around the world 8 times in one second.

[object Object],[object Object],2) When a starting pistol is fired we see the smoke first and then hear the bang.

Properties of Light summary ,[object Object],[object Object],[object Object],[object Object]

Part 2 - Reflection ,[object Object],Incident ray Normal Reflected ray Angle of incidence Angle of reflection Mirror

[object Object],Angle of incidence = Angle of reflection In other words, light gets reflected from a surface at ____ _____ angle it hits it. The same !!!

Clear vs. Diffuse Reflection ,[object Object],Rough, dull surfaces have a diffuse reflection. Diffuse reflection is when light is scattered in different directions

Using mirrors ,[object Object],1) A periscope 2) A car headlight

Color ,[object Object],We can demonstrate this by splitting white light with a prism: This is how rainbows are formed: sunlight is “split up” by raindrops.

The colors of the rainbow: ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Adding colors ,[object Object],[object Object],Adding blue and red makes magenta (purple) Adding blue and green makes cyan (light blue) Adding all three makes white again Adding red and green makes yellow

Seeing color ,[object Object],For example, a red book only reflects red light: White light Only red light is reflected Homework

A white hat would reflect all seven colours: A pair of purple trousers would reflect purple light (and red and blue, as purple is made up of red and blue): Purple light White light

Using colored light ,[object Object],White light Shorts look blue Shirt looks red

[object Object],Red light Shirt looks red Shorts look black Blue light Shirt looks black Shorts look blue

Refraction Refraction is when waves ____ __ or slow down due to travelling in a different _________. A medium is something that waves will travel through. When a pen is placed in water it looks like this: In this case the light rays are slowed down by the water and are _____, causing the pen to look odd. The two mediums in this example are ______ and _______. Words – speed up, water, air, bent

Light presentation

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