Measuring the Speed of Light in Composite Materials

(PhysOrg.com) -- Although the speed of light is constant in a vacuum, light slows down a small amount when traveling through other materials. While it's relatively easy to measure the speed of light in mediums made of one material, it's much more difficult to track light's speed through composite materials. Now, a new technique can determine the speed of light in composite materials by varying the pressure of light.
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