Total internal reflection.
Light is reflected internally and this is used to direct light in a camera.
Convex lenses are able to bring rays of light to a FOCUS (focal point)
Thin lenses have a long focal point and fat lenses have a short focal point.
There are 3 golden rules with dispersion of light that you must remember.
Rule 1) any ray through the opticle centre of the lens continues un deviated.
Rule 2) any ray parallel to the principle axis is refracted through the focal point.
Rule 3) any ray through the focal point is refracted parallel to the principle axis
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