|Lasers find a wide range of applications from CD players to steel cutters. Which of the following properties of laser make them much more useful than ordinary light sources?|
|1. Lasers are polychromatic.|
|2. Laser light is coherent.|
|3. Laser light is collimated.|
|Select the correct answer using the codes given below.|
A) 1and 2
B) 2 and 3
C) Only 1
D) None of these
Correct Answer: B
Solution :[b] Lasers are monochromatic (single colour) as compared to normal light which is polychromatic (multiple colours). Laser light is also coherent (all wavelengths are in phase) and collimated (light waves travel in the same direction parallel to each other). Because of the above three properties laser light is able to focus at single point with intense power while normal light becomes diffused and powerless.
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