Why is gold better than aluminum to make a 30% reflective layer

Subject: Why is gold better than aluminum to make a 30% reflective layer

Date: Thu Dec 23 04:31:50 1999
Posted by Michael Hompus
Grade level: No grade entered. School: OTB Engineering
City: Eindhoven State/Province: No state entered. Country: Netherlands
Area of science: Physics
ID: 945945110.Ph

Message:


Fi. The semi reflective layer in a DVD disc is made of gold or silicon.  
The reflective layer is made of aluminium (as in CD's).  It appears to me 
that a semi reflective layer  of aluminium would be a lot cheaper than 
gold, yet this is not done.

Re: Why is gold better than aluminum to make a 30% reflective layer

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