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RE: Laser Technology: Understand How your DVD/CD Players, Laser printers, Holography and Bar-code Scanners works
Monochromatic: Ideally, the natural light is a mixture of different colors (multiple wavelengths), but the laser light is of a single color (one wavelength), i.e., it is monochromatic. These can be proved using a prism.
Actually, if I am not wrong, there is always a spread in wavelengths It can however be made very (very very!) small. If I remember well, we can reach precision of 10-18 (I don't remember the exact numbers for the exponent, and I cannot check them, but it is amazingly large).
Yes you are right
That very very small is what makes laser a unique and powerful light
For the ordinary light source, the wavelength spread is 1 in 10^6(10^-6) and 1 in 10^16 (10^-16) according to engineering physics by Nadu