How light bends as it moves between mediums Refraction of Light How light bends as it moves between mediums

Refraction Refraction occurs because light travels at different speeds in different media When light changes speed as it moves from one medium to another its direction also changes

Refraction As the light ray travels from air to water it will bend toward the normal. Draw this on the picture below. What would happen if a light ray travelled from water to air?

Refraction To know if the light is going to speed up or slow down we need to know the density of the media. More dense media will cause light to travel slower and less dense media will cause light to travel faster

Converging and Diverging Lens Pre - Lab Complete the Pre - Lab for next day You may have to do some of your own research

Refraction plays a role in human vision The cornea causes about 80% of refraction as light passes through The lens causes about 20% of the refraction as light passes through However, this part is responsible for focusing on close objects

So how does a prism create a rainbow?

Using the diagram, explain how a prism works

Near sighted and far sighted If you are curious about what varying eye diseases look like click here

Before watching the video... How do you think laser eye surgery works?

So what about the future? Smart Contact lenses Check glucose readings Cure colour blindness Multifocal Digital overlay Visual reality

Workbook pages Complete workbook pages 137, 139, 140, and 141