A normal DVD player uses a 650nm laser to read details from the surface of a dis

Question

A normal DVD player uses a 650nm laser to read details from the surface of a disk, on which up to 4.7 GB of data can be stored.

An HD DVD player uses a 405nm laser in connection with disks that can store up to 15 GB of data.

The newer Blu-Ray technology uses a 405nm laser and can store up to 25 GB on a disk.

Which of the following are true?
False True  A higher frequency laser can detect finer surface details
False True  The "D" in the Rayleigh formula is approximately inversely proportional to the amount of data on the disk.
False True  More data means fine surface details
False True  The normal DVD laser is red
False True  The Blu-Ray DVD laser is blue

Explanation / Answer

True

True

True

True

True

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