List of top Geophysics Questions on Lasers

Match List-I with List-II

List-I	Concept / Device	List-II	Description
A	Optical Pumping	II	Population Inversion
B	He-Ne Laser	I	Four Level Laser
C	Ruby Laser	III	Three Level Laser
D	Optical Resonator	IV	Pair of optically plane parallel mirrors

Which of the following is not a characteristic of a laser light?

In order to produce LASER, the correct sequence of processes given below will be
(A) Pumping
(B) Population inversion
(C) Stimulated emission
(D) Light Amplification
Choose the correct answer from the options given below: