(A) In He-Ne laser, population inversion takes place between energy levels of neon atoms.
(R) : Helium atoms have a meta stable energy level

Options

A. Both 'A' and 'R' are true and 'R' is the correct explanation of 'A'.
B. Both 'A' and 'R' are true and 'R' is not the correct explanation of 'A'
C. 'A' is true and 'R' is false
D. 'A' is false and 'R' is true

Answer

A