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When waves or light change direction as they move from one substance to another.

A lens curing outwards which will have a shorter focal length and therefore be a more powerful lens.

What the power of the lens is measured in and can be found by 1 over the focal length of lens in meters.

A lens that causes parallel waves of light to come into focus.

The point where waves of light come into focus

When waves move through a narrow gap or past an obstacle, they spread out from the edges.