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Remember?

· How are rainbows formed?

· How is `white' light made?

· What happens when a ray of light is shone at a mirror?

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Spectrum of Light
Light is made up of SEVEN colours ­

Red Richard

Orange Of

Yellow York

Green Gave

Blue Battle

Indigo In

Violet Vein

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Reflection in a mirror




Angle of incidence = Angle of reflection

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What do we already know:

· White light is made up of 7 colours.

· Light travels in straight lines.

· Light can be reflected.

· Light can be refracted (bent).

· Light can be absorbed.

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More on Light:

· Light travels in waves.

· Light transfers energy from one place to another.

· Visible light (light that we see) is part of the
electromagnetic spectrum. (We will come back to this
later)

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Light waves:

A wave is affected by two
things:

· Its wavelength ­ how long it
is.

· Its frequency ­ how many
waves pass a certain point in
1s.

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Wavelength:

Remember ­ waves transfer energy and not matter!

Therefore, waves of different wavelengths have
different effects.


Task: Calculate the wavelength of the waves.

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