香港介紹ppt

標題:

一般CD上用作反射雷射光的是甚麼物料？

發問:

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最佳解答:

The reflective material coated on CD is typically aluminium. Please refer to the web-page below: https://en.wikipedia.org/wiki/Disc_rot (Read the paragraph under "Causes") 2015-06-28 17:28:23 補充： Your suppl question: The reflectance of gold is only slightly better than aluminium at wavelength between 600 nm ~700 nm within the visible spectrum. If infra laser is used, reflectances of gold and aluminium do not differ much. 2015-06-28 17:30:24 補充： (cont'd)..... Please refer to the first diagram on the web-page: https://en.wikipedia.org/wiki/Reflectance It is thus not too worthy for CD coated with gold.

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