What are the properties of light?

What is the law of reflection?

What happens when fraction occurs?

How fast are each of the colours in the dispersion of light?
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What are the two types of lenses?

What is the principal focus?

What is the focal length?

What is the location of the image at each of the object points?

What is the nature of each and are each of them erect or inverted?

What size are each of them?

What are the uses for each?
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what is a diffuse reaction?

What is total internal reflection?

What are the us for total internal refraction?

what are optical fibres?

How do optical fibres work?

What are optical fibres used for?

What are the advantages of optical fibres?

What happens if the optical fibre is too tightly bent?

What are uses for each of the electromagnetic waves?
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What are the dangers for each of the electromagnetic waves?