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Stand outdoors to see and feel the radiation pouring from the Sun.
Ultraviolet runs from 4000 A down to about 100 A, X- rays take over to about 1 A, and these are followed by the gamma rays to no known lower limit.
The named divisions are artificial and serve only to block out large spectral segments.
Violet light is slowed in a glass of water significantly more than red light.
As a result shorter visual waves refract more than do longer ones.
In the modern spectrograph, light is sent from the telescope onto a "collimator," a curved mirror that straightens the converging beam.