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LASER colors function

  • #1
106
0
Hi Guys!

My teacher once asked me the following question:

Lasers are used to burn and read CDs. Why a laser that emits blue light would be capable of burning and reading more than the one with red light.

Can u tell me the answer
 

Answers and Replies

  • #2
429
0
more energy. (for light/photons, energy is proportional to frequency.)
 
  • #3
Dr Transport
Science Advisor
Gold Member
2,353
486
The wavelength of a blue laser is shorter than that of a red laser. The density of the tracks on a disk is inversely proportional to the read/write wavelength.
 

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