Questions on Lasers in Printers and Computers

1. How does a TV remote work?  Why don't you have to point it directly at the TV?
2. Describe how a page is xeroxed? 
3. What are the different steps in laser printing a page versus xeroxing a page?
4. Why does the toner only stick to the drum where light had shone?
5. What are some of the advantages of a CD over a magnetic tape?  over a 33 rpm  record?
6. Why can't the pits that are written onto a CD be made smaller in order to store more information on the same disk?
7. Most CD writers (burners) today are non-erasable.  Why is the name burner appropriate?
8. Describe the production process to make a CD?  How much do you think the CD actually costs to manufacture?
9. Why is the read-out of a CD so insensitive to dust and scratches?
10. What techniques are used to make rewrite-able CDs?