英语翻译Light WaveLight travels in waves,like ripples on a pond.

英语翻译
Light Wave
Light travels in waves,like ripples on a pond.The distance from the top of one wave to the top of the nexe is the wavelength.Ordinary white light is made up of many wavelengths,and its waves travel in every direction.Laser light,on the other hand,is of one wavelength,with all the waves moving in one direction.They stay together within a straight,narrow beam,instead of spreading out like a flashlight beam.That is the reason the light from a laser is strong.
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