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Question 5: Explain the difference between laser light and light from an incandescent lamp?


Differences between laser light and light from an incandescent lamp are as follow;

Laser Light Lamp light
Laser light is unidirectional. It moves in one direction. Light from a lamp is multi-directional. It moves in all directions from the lamp.
Laser light has one wavelength. Light from a bulb has a number of wavelengths.
Laser light is phase coherent. This means all radiations have the same phase. Lamp light is not in phase. Radiations from a lamp light have different phases.
Laser light is produced due to stimulated emission. Lamp light is produced due to spontaneous emission of radiations.
Laser light is more intense as they are phase coherent. Lamp light is comparatively less intense as they are not phase coherent.


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