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  • A lens is a curved piece of a transparent material such as glass or plastic. A lens

  • is similar to a mirror except light is refracted, not reflected. A lens has an optical axis

  • which divides the lens in half. The point on the optical axis where distant light rays

  • meet when refracted, is called the focal point. The distance from the focal point to the lens

  • is called the focal length, f. There is a focal point on both sides of the lens.

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A lens is a curved piece of a transparent material such as glass or plastic. A lens

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B2 中高級

光和光學 - 折射和透鏡 (Light and Optics - Refraction and lenses)

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