RAINBOWS by Ava Nolan

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RAINBOWSby Ava Nolan
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Rainbow Facts

• Rainbows are multi-coloured arcs that
• form in the sky
• A rainbow arch is a 42 degree angle
• starting opposite the sun
• A rainbow is not an object, it cannot be
• felt or touched

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Rainbow Facts

• A rainbow is a full circle of light.
• A rainbow occurs when it is raining in
• one part of the sky and sunny in another.
• Rainbows can be seen not just in rain but
• also mist and fog whenever there are
• water drops in the air and light shining
• from behind at the right angle

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Circle of Light
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Rainbow shape

• Rainbows are an arc shape because of
• the bending of and dispersion of light
• through millions of water droplets.

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Refraction

• As the light travels through the water
• drop and disperses, it also does
• something called refraction.
• Refraction is what happens to the light
• when it hits the water drop, it changes
• speed and bends.

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Light Refraction
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Colours of the Rainbow

• Sir Issac Newton identified the 7 colours
• of the spectrum that make up white light.
• All of which are present in a rainbow in
• the order
• red
• orange
• yellow
• green
• blue
• indigo
• violet

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Colours of the Rainbow

• The name ROY G BIV is a good way to
• remember these colours and their order.
• Or
• Richard Of York Gave Battle In Vain

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White Light

• Sunlight is made up of the colours of the
• rainbow
• White light is when the colours are all
• mixed together
• When sunlight travels through the air in
• the same direction we see white light

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White Light

• When the sunlight enters through a
• raindrop the colours separate causing us
• to see a rainbow (dispersion)
• Each raindrop makes its own rainbow but
• it takes millions of raindrops for us to
• see a rainbow.

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Light dispersion
Dispersed light
White light
Prism (or raindrop)
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Rainbow Experiment

• What you'll need
• A glass of water
• (about three quarters full)
• White paper
• A sunny day

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• Instructions
• Take the glass of water and paper to a part of
  the room with sunlight.
• Hold the glass of water above the paper and watch
  as sunlight passes through the glass of water,
  refracts (bends) and forms a rainbow of colours
  on your sheet of paper.
• Try holding the glass of water at different
  heights and angles to see if it has a different
  effect.

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Thanks for watching