Light Properties

Light ,[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.

[object Object],A luminous object is one that produces light. A non-luminous object is one that reflects light. Luminous objects Reflectors -The Sun - Lamps - Lights - Lasers - Campfires ,[object Object],[object Object],[object Object],[object Object]

[object Object],Shadows are places where light is “blocked”: Rays of light

Out of the Darkness ,[object Object],[object Object]

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 THE SAME 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

Spherical Mirrors - Concave ,[object Object],C F

Spherical Mirrors – Concave Object Inside the Focal Point ,[object Object],C F

Spherical Mirrors - Convex ,[object Object],C F

Colour ,[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 colours of the rainbow: ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Remember: Roy G. Biv !!!

Light from the Sun ,[object Object],[object Object]

Wavelengths of Light ,[object Object],[object Object],[object Object]

Adding colours ,[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 colour ,[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 pants, in addition to being ugly, would reflect purple light (or red and blue, as purple is made up of red and blue): Purple light White light

Using coloured 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

Using filters ,[object Object],Red Filter Magenta Filter

Light Properties

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Light Properties