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Refraction and Lenses

Refraction and Lenses. 7 SCIENCE. Review: What is refraction?. Refraction occurs when light bends Light bends as it passes from one substance to another Ex. A straw in a glass into water Refraction can be caused by a lens

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Refraction and Lenses

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  1. Refraction and Lenses 7 SCIENCE

  2. Review: What is refraction? • Refraction occurs when light bends • Light bends as it passes from one substance to another • Ex. A straw in a glass into water • Refraction can be caused by a lens • A lens is a transparent object with at least one curved side that causes light to bend • More curved sides = more light bends

  3. Lenses • Concave and convex lenses form images OPPOSITE to that in concave and convex mirrors • Convex lens • Thicker in the center than at the edgesex: magnifying glass • Concave lens • Thicker at the sides that in the center ex: glasses for people that cannot see far objects

  4. Convex lenses • Light rays travelling through a convex lens are bent so they meet at a focal point • Image formed is similar to that of a concave mirror • If the object is 2+ (or more) focal lengths from the lens, the image appears inverted and smaller • If the object is closer to the lens than one focal length, the image is upright and larger

  5. Concave lenses • Light rays travelling through a concave lens are bent and spread away from each other, do not meet • Image formed is similar to thatof a convex mirror • Image formed is upright and smaller than the object • Ex: eyeglasses if you cannot see far

  6. Which pictures show a concave lens? Convex lens? How do you know?

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