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