Laser Light Effect
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Laser light exhibits much stronger interference effects than light from a flashlight. This is because?
A laser is coherent light. Virtually all the photons have the same wavelength and can be superimposed. A flashlight is "white light". The red, blue, green, ect. wavelengths don't fall easily together (trough on trough and crest on crest).
When dealing with one photon at a time through a slit aperture you couldn't tell if the photon source was a laser or light bulb.
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