
Light waves change speed when they pass across the boundary between two substances with a different density , such as air and glass. This causes them to change direction, an effect called refraction .
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2 hours ago · The reason light changes direction (“bends”) when traveling through glass, is because light travels slower in glass than in air. In general, light will “bend” any time it goes …
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13 hours ago · What happens when light enters a glass block? If the light is entering from air or a vacuum, the light will slow down. The affect of this, if the light hits the glass at an angle, is that …