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FIFTH SEMESTER U.G. DEGREE EXAMINATION, NOVEMBER 2021
(CBCSS—UG)
Physics/Applied Physics
PHY 5B 08/APH 5B 08—OPTICS
(2019 Admissions)
Time : Two Hours Maximum : 60 Marks
The symbols used in question paper have their usual meanings.
Section A (Short Answer Type)

Answer at least eight questions.
Each question carries 3 marks.
All questions can be attended.

Overall Ceiling 24.

Explain Fermat’s principle of stationary time.

Discuss the principle of superposition of waves.

Explain the terms coherence time and coherence length.

Discuss the Rayleigh criterion of resolution.

Write down the conditions for maxima and minima for the Newton’s rings in the reflected system.

Distinguish between Fresnel and Fraunhofer kinds of diffractions.

a Fee YS

Show a figure illustrating the Huygens wave surfaces produced by a point source embedded in a
positive doubly refracting crystal.

0

How is an elliptically polarized light produced ?
Distinguish between dextrorotatory and laevorotatory substances.
10. Discuss the basic steps in holography.
11. Distinguish between step index and graded index optical fibers.
12. Discuss the basic parts of a fiber optic sensor.
(8 x 3 = 24 marks)
Section B (Paragraph/Problem Type)

Answer at least five questions.

Each question carries 5 marks.

All questions can be attended.
Overall Ceiling 25.

13. Obtain the Newtonian lens formula.

Turn over

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