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1. A(n) is an image of a distant object caused by light refraction through air of varying temperature.
2. A(n) is a curved piece of glass or other transparent substance that is used to refract light.
3. A(n) lens is thicker in the center than at the edges.
4. A(n) lens is thinner in the center than at the edges.
5. The is a measure of how much a ray of light bends when it passes from one medium into another.
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