The scale of light can be described by numbers - called the frequency - and as the numbers get higher, the light goes from red to blue to ultraviolet. We can't see ultraviolet light, but it can affect photographic plates. It's still light - only the number is different. (Richard Feynman)

The scale of light can be described by numbers - called the frequency - and as the numbers get higher, the light goes from red to blue to ultraviolet. We can't see ultraviolet light, but it can affect photographic plates. It's still light - only the number is different.

Richard Feynman

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