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(C) Long term programs take a long time to implement
A group of stars arranged in a define pattern is called constellation.
When a ray of white light passes through a prism, it splits up into rays of constituent colours or wavelengths. This phenomenon is called the dispersion of light.
Electrolytes are the chemical substances which conduct electric current in their solution or in molten state.
Distilled water and Kerosene.
The angle between the incident ray and the normal is called angle of incidence