When the light from two lamps falls on a screen, no interference pattern can be obtained. Why
is this?
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Answer:
Because A The lamps are not point sources.
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When the light from two lamps falls on a screen, no interference pattern can be obtained, because they are not coherent source.
The conditions for the interference of light are:
- Light source should be coherent, i.e., they must have same frequency.
- Light waves should have same wavelength.
- The source should be monochromatic, i.e., the colour of the source lighting should be of one colour.
If the light comes from two lamps, the frequency of the waves of the lights are different,i.e., they are not coherent source, so, they will not superimpose each other. So, there will be no interference.
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