What is happening here…??

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Presentation transcript:

What is happening here…??

Refraction Success Criteria Today you will: Describe what happens when light is refracted Record observations using a labelled diagram Explain what happens when light travels through a lens

Refraction

Refraction Transparent objects can only be seen if light changes direction when it passes through them. This is refraction. It happens because light travels at different speeds in different materials, so one edge of a ray of light is slowed down before the other. How could we model refraction?

Refraction Success Criteria Today you will: Describe what happens when light is refracted Record observations using a labelled diagram Explain what happens when light travels through a lens

Investigating refraction How does the refraction depend upon the angle of the light arriving at the block?

Investigating refraction Draw a line using a ruler, then draw the normal line (remember this is always at a right angle) Line up the side of the block with the first line and set up the ray box to shine a ray of light towards it. Draw dots to mark the light rays you can see.

Investigating refraction 1. The ray travelling into the glass block is the incident ray. Label the two incident rays on your diagram. 2. The ray travelling through the glass block is the refracted ray. Label the two refracted rays on your diagram. 3. Describe the path of the light as it travels towards and through the block. Include light travelling along the normal and at other angles.

Refraction Success Criteria Today you will: Describe what happens when light is refracted Record observations using a labelled diagram Explain what happens when light travels through a lens

Lenses Where might you find a lens? What do you think lenses do?

Refraction Success Criteria Today you will: Describe what happens when light is refracted Record observations using a labelled diagram Explain what happens when light travels through a lens

Uses of refraction – survival! The Archer fish has to overcome refraction just to catch a meal… https://www.youtube.com/watch?v=_6LsXA_FJIE

Uses of refraction – survival! Where should spear-fishermen aim… the head or the tail?