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Light and Optics Introduction

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Nikolas Kirincic

on 9 February 2011

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Transcript of Light and Optics Introduction

light and optics 1. properties of light 2. colours 3. types of materials 4. the electromagnetic spectrum Part I: Properties of Light light travels in straight lines light travels veryve very quickly 300 000 kilometres/second that's eight times around the world... in one second! > 1225 kilometres/hour (the speed of sound at sea level) we see objects because they
reflect light into our eyes luminous objects produce light non-luminous objects reflect light shadows are places where light is blocked sources of light chemiluminescence incandescence phosphorescence electric discharge fluorescence bioluminescence chemical energy changes into light energy light is emitted because of high temperatures energy is released shortly after energy
is received from another source light is emitted because of charges
passing through a gas emits energy while receiving
energy from another source living things make themselves
glow by undergoing a reaction material types transparent transluscent opaque light passes through easily light passes through but is also reflected light light does not pass through;
light is absorbed or reflected Part 3. & Part 2: Colours white light is not a single colour... it is made up of a mixture of
the seven colours of the rainbow we can demonstrate this by
splitting white light with a prism Red Orange Yellow Green Blue Indigo Violet the colour of an object depends on the colours of light it reflects white light, containing all colours hits the object only blue light is reflected Part 4: The Electromagnetic Spectrum frequency high frequency low frequency amplitude high amplitude low amplitude the angle of incidence = the angle of reflection clear reflection smooth, shiny surfaces
have a clear reflection diffuse reflection rough, dull surfaces have
a diffuse reflection refraction: light bending when waves bend or slow down due to travelling in a different medium the media are
air and water
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