Prism
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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

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

Last lesson

  • Refraction of light


Refraction

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


The mug trick

The mug trick!


The mug trick1

The mug trick!


Homework to show and explain this to your parents due friday 29 th jan

Homework – To show and explain this to your parents! Due Friday 29th Jan


Prism1

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

Today’s lesson

  • Total Internal Reflection

  • Fibre-optic cables

  • Seeing colours


Another little investigation

Another little investigation!

Aim all beams at the centre of the semi circle


Another little investigation1

Another little investigation!

Aim all beams at the centre of the semi circle


Total internal reflection

Total Internal Reflection


Critical angle

Critical Angle?


Critical angle1

Critical Angle?


Critical angle2

Critical Angle?


Critical angle3

Critical Angle?


Critical angle4

Critical Angle?

Critical angle


Total internal reflection1

Copy please!

Total Internal Reflection

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


Total internal reflection2

Total Internal Reflection

Critical angle

sin c = 1/η

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


Examples of total internal reflection

Examples of Total Internal Reflection


Examples of total internal reflection1

Examples of Total Internal Reflection


Examples of total internal reflection2

Examples of Total Internal Reflection


Examples of total internal reflection3

Examples of Total Internal Reflection


Examples of total internal reflection4

Examples of Total Internal Reflection


Examples of total internal reflection5

Examples of Total Internal Reflection


Seeing and colours

Seeing and colours


We see things because light is reflected into our eyes

We see things because light is reflected into our eyes


Red objects only reflect red light

Red objects only reflect red light


A red objects in green light would look black no reflected light

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


Combining 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

Combining light


Let s try some questions

Let’s try some questions!

“Coloured lights”


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