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# Prism - PowerPoint PPT Presentation

Copy please. Prism. What happens when we shine white light into a prism?. Red lights bends the least. Many colours blended together. White light. Violet light bends the most. Last lesson. Refraction of light. Refraction. Beam of light.

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Prism

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### Prism

What happens when we shine white light into a prism?

Red lights bends the least

Many colours blended together

White light

Violet light bends the most

### Last lesson

• Refraction of light

### Refraction

Beam of light

Light going from air to glass bends towards the normal

Glass block

Light going from glass to air bends away the normal

### Prism

What happens when we shine white light into a prism?

Red lights bends the least

Many colours blended together

White light

Violet light bends the most

### Today’s lesson

• Total Internal Reflection

• Fibre-optic cables

• Seeing colours

### Another little investigation!

Aim all beams at the centre of the semi circle

### Another little investigation!

Aim all beams at the centre of the semi circle

Critical angle

### Total Internal Reflection

If the angle is bigger than the critical angle we get total internal reflection

### Total Internal Reflection

Critical angle

sin c = 1/η

sin(critical angle) = 1/(refractive index)

### A Red objects in green light would look black (no reflected light)

YouTube - Bill Nye the Science Guy - 16 - Light and Color 1/3

YouTube - Bill Nye the Science Guy - 16: Light and Color 2/3Related Videos

### Let’s try some questions!

“Coloured lights”