Multiple choice

What are three major types of lasers?

  1. Gas, solid state, diode

  2. Diode, inverted, pointer

  3. Pointer, diode, CD

  4. Gas, metal vapor, rock

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A Correct answer
Explanation

The three major types of lasers are gas lasers (like HeNe), solid-state lasers (like Ruby or Nd:YAG), and semiconductor/diode lasers.