N A L A N D A O P E N U N I V E R S I T Y
M.Sc. Physics, Part-II
PAPER-XIV
(Photonics)
Annual Examination, 2016
Time 3 Hours. Full Marks 80
Answer any Five Questions.
All questions carry equal marks.
1. What is LED Describe its design and explain its working.
2. Derive relation between Einstein's A and B Co-efficients. Give the weak points in Einstein's
theory.
3. What do you mean by 'Core and Cladding' Describe the structures of different types of
optical fibres with ray path.
4. Describe Avalanche Photodiode (APD). Illustrate its advantages.
5. How plasma screen is different from LCD screen What is the future of LCD screen
6. Explain the difference between analog and digital communication. Why digital
communication is more suitable with modern day requirements
7. Describe the principles of Nd-Yag Laser. What are its applications.
8. What is optical fibre flow sensor Describe optical fibre gyroscope.
9. Describe intrinsic semiconductor laser and doped semiconductor laser. What is the limitation
for these lasers to operate continuously
10. Obtain a relation between divergence and waist size of the beam for a Gaussian distribution
of wave energy.