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DVD players use a red laser to read its media, while blu-ray discs are 'burned' using a blue laser. Because of the difference in wavelength, (blue light has a shorter wavelength than red light) there is a difference in frequency, and therefore DVD players cannot read blue-ray discs.

However, it seems that newer models of Blu-ray Players are 'backwards compatible' meaning that they are able to play Blu-Ray discs as well as older versions of the CD (compact disc). My theory for this capability comes from an 'optical head device.' This device has the capability of focusing light, thereby changing the wavelength and frequency and color of the laser emitted all at the same time.

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Q: Why aren't DVD players able to read Blu-ray discs?
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