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P6.C Explaining Refraction

by paulbhill on Jul 29, 2008

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P6.C Explaining RefractionPresentation Transcript

• Explaining Refraction
• Explaining Refraction First we need a Perspex or glass block set at an angle The Perspex block is denser than air, but allow light to travel through it (i.e. it is transparent)
• Explaining Refraction
• Explaining Refraction
• Explaining Refraction To understand refraction, we need to think of light as a wave travelling at 90 o to the light ray
• Explaining Refraction To understand refraction, we need to think of light as a wave travelling at 90 o to the light ray
• Explaining Refraction Imagine different points along that wave
• Explaining Refraction Imagine different points along that wave
• Explaining Refraction As light travels towards the Perspex block, the wave moves forward
• Explaining Refraction As light travels towards the Perspex block, the wave moves forward
• Explaining Refraction As light travels towards the Perspex block, the wave moves forward
• Explaining Refraction As light travels towards the Perspex block, the wave moves forward
• Explaining Refraction As light travels towards the Perspex block, the wave moves forward
• Explaining Refraction
• As the light hits the Perspex block it slows down because Perspex is more dense than air
• To light, the Perspex is like walking through treacle
• The slower light does not travel as far in a given time
• Explaining Refraction
• As the light hits the Perspex block it slows down because Perspex is more dense than air
• To light, the Perspex is like walking through treacle
• The slower light does not travel as far in a given time
• Explaining Refraction But the light that is this travelling through air is still moving quickly, so it travels further in a given time
• Explaining Refraction But the light that is this travelling through air is still moving quickly, so it travels further in a given time
• Explaining Refraction But the light that is this travelling through air is still moving quickly, so it travels further in a given time
• Explaining Refraction In the Perspex, all the light travels at the some speed
• Explaining Refraction In the Perspex, all the light travels at the some speed
• Explaining Refraction In the Perspex, all the light travels at the some speed
• Explaining Refraction In the Perspex, all the light travels at the some speed
• Explaining Refraction In the Perspex, all the light travels at the some speed
• Explaining Refraction In the Perspex, all the light travels at the some speed
• Explaining Refraction In the Perspex, all the light travels at the some speed
• Explaining Refraction As the light hits the air again it speeds up because air is less dense than Perspex
• Explaining Refraction As the light hits the air again it speeds up because air is less dense than Perspex
• Explaining Refraction As the light hits the air again it speeds up because air is less dense than Perspex
• Explaining Refraction As the light hits the air again it speeds up because air is less dense than Perspex
• Explaining Refraction As the light hits the air again it speeds up because air is less dense than Perspex
• Explaining Refraction As the light hits the air again it speeds up because air is less dense than Perspex
• Explaining Refraction As the light hits the air again it speeds up because air is less dense than Perspex