Question

Laser beam is used:

• A. In magnetic tape recording
• B. In DVD disc recording
• C. In analog sound recording in CD
• D. In analog sound reproduction from CD

Hint:

Optical storage devices use different laser wavelengths: - CDs use an infrared laser ($780\text{ nm}$). - DVDs use a red laser ($650\text{ nm}$). - Blu-ray discs use a blue-violet laser ($405\text{ nm}$), which has a much shorter wavelength, allowing it to write data at a much higher density.

Answer 1

The Correct Option is B