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7 sci ch 9-3 vocab

7th Grade Science Chapter 9 Lesson 3 vocabulary

TermDefinition
index of refraction A measure of the amount a ray of light bends when it passes from one medium to another.
mirage An image of a distant object caused by refraction of light as it travels through air of varying temperature.
lens The flexible structure that focuses light that has entered
concave lens A lens that is thinner in the center than at the edges.
convex lens A lens that is thicker in the center than at the edges.
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