Answer all the questions :
1.Why the output of the Nd.YAG laser with Xenon/Krypton flash lamp is pulsed?
2.Why the rays making smaller and greater angles arrive at same instant in graded index fiber?
3.What is the difference between active and passive sensors?
4.What is the path difference if a glass plate of ref.index and thickness t is introduced in one of the paths of two coherent rays from same source.
5.What is the use of He gas in CO2 gas laser?
6.What is the change in the field of view of telescope in a M.I. experiment , if a compensation plate is introduced?
7. In a He-Ne laser how only one wavelength of laser light is derived and what happens to the emission of other wavelengths.
8. How in a graded index fibre, inter modal dispersion is avoided?
9.What is the purpose of having a metastable state in lasers?
10.What is the need for population inversion?
