Differentiate between spontaneous and stimulated emission of light with diagram.
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Spontaneous emission
Stimulated emission
Excited atoms comes to ground state on its own accord
Excited atoms comes to ground state after interaction with incident photon.
Radiations are in random direction , phase and wavelength 
Radiations are coherent , monochromatic and in same direction.
Independent of outside circumstances
Dependent of outside circumstances
No metastable state exist
Metastable state exist
Number of photons emitted are less
Number of photons emitted are more

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