How Do Prism Glasses Work?

  1. Prism Glass Basics

    • Prism glasses work by refracting, or bending, white light. A light beam travels from the air to the glass prism, causing each color that makes up white light to reflect at its own unique angle. This forms the rainbow-like color pattern associated with prisms.

    Why Prisms Refract Light

    • Prism glasses work because they're more dense than air. Based on the laws of physics, when light travels from air to the more dense prism glass, it slows down. This causes the light to refract, or bend.

    Why the Colors Form a Rainbow

    • White light is made up of a mix of colors, each with its own frequency, or wavelength. A color's wavelength is always the same and is different from the other colors, which makes each color bend (or refract) at a unique angle. That's why the colors coming from a glass prism (or those in a rainbow) are always in the same order--they always refract the same way.

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