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Qus: Which technology is used in optical disks?

Qusऑप्टिकल डिस्क में किस तकनीक का प्रयोग किया जाता है?

A. मैकेनिकल
B. इलेक्ट्रिकल
C. इलेक्ट्रो मैग्नेटिक
D. लेज़र

D. Laser


The optical disc makes use of laser technology: digital data are recorded by burning a series of microscopic holes, or pits, with a laser beam into thin metallic film on the surface.

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