Question

Which of the following is not a type of laser
A) Hydrogen laser
B) C{{O}_{2}}
laser
C) Neon laser
D) Argon laser

Answer 1

Hydrogen laser is not a type of laser.

Explanation:

Gas lasers are of following types:

Helium - neon laser, Argon laser, Krypton laser, Xenon ion laser, Nitrogen laser, Carbon dioxide laser, Carbon monoxide laser.

But Hydrogen laser does not exist.

Hence, option (A) is correct.