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Self-Darkening Sunglasses

Self-Darkening Sunglasses. A Reversible Chemical Reaction. Glasses that darken in sunlight and become clear in ordinary room light. Self-darkening sunglasses use a reversible chemical reaction called “photochromic” Photochromic is derived from photo, meaning light, and chromic meaning color

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Self-Darkening Sunglasses

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  1. Self-Darkening Sunglasses A Reversible Chemical Reaction

  2. Glasses that darken in sunlight and become clear in ordinary room light

  3. Self-darkening sunglasses use a reversible chemical reaction called “photochromic” Photochromic is derived from photo, meaning light, and chromic meaning color - a change in color with light Example of a ReversibleChemical Reaction

  4. Napthopyran Molecule Colorless Form Weak Bond Absorbs only Ultraviolet Light, not Visible Light

  5. Napthopyran Molecule Effect of UV Light Ultraviolet Light UV Light Breaks the Weak Bond and Electrons Shift Positions

  6. Napthopyran Molecule Dark Colored Form Molecule changes shape after new bonds are formed New molecule form absorbs long wavelength visible light

  7. Reversible Photochromic Reaction of Napthopyran Sunlight Dark Colored Form Colorless Form No Sunlight

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