Multiple choice

From which of the following is a beam of light used to record and retrieve data on an optical disk?

  1. Coloured light

  2. Laser

  3. Polarised light

  4. Un-polarised light

  5. None of these

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The data is stored on the disc with a laser or stamping machine. Optical discs are most commonly used for storing music and allow a narrower light beam.