Splitting of light in seven different colors showing the complete spectrum is known as dispersion.
Explanation:
The visible part of the complete EM spectrum, visible light, is made up of seven different colors (Acronym: VIBGYOR). When visible light beam is passed through a prism or diffraction grating it splits into 7 different colors, this process is known as dispersion. The band of 7 colors is called as Spectrum of light.
Every element shows a different spectrum. When we study the spectrum of a compound we can get to know which all elements are present inside it. This technique is known as Spectroscopy.
The same technique is used to study the composition of stars. Astronomers study the spectrum of light coming from the stars to know the elements present inside them. Along with that we can also find out the relative motion of stars using the Doppler's effect. We can get to know whether an object is moving towards or away from us by studying its spectrum.
Anybody who has dealt with Christmas Tree lights knows what can be done. You must take a bulb you know to be good and try each bulb in turn until the whole string lights up. If two bulbs are dead, give up and go buy another string. Two bulbs create a lot of combinations.
"People in location C would complain about foul taste in water".
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