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FIFTH SEMESTER (CBCSS—UG) DEGREE EXAMINATION, NOVEMBER 2022

Time

10.
11.
12.

Physics/Applied Physics
PHY 5B 08/APH 5B 08—OPTICS
(2019 Admission onwards)

: Two Hours Maximum : 60 Marks

The symbols used in question paper have their usual meanings.
Section A (Short Answer Type)

Answer all questions in two or three sentences.
Each correct answer carries a maximum of 2 marks.

State the laws of reflection.

Explain the law of cosine square for the intensity distribution in the interference of two waves of
the same amplitude.

List any four conditions for obtaining a distinct well-defined interference pattern.
Explain the origin for the colours of thin films.

Give an expression for the intensity distribution in Fraunhofer diffraction due to N slits and explain

the terms involved.
Give the grating equation and explain the terms involved.

What do you mean by the resolving power of agrating ? Give an expression for the same explaining

the terms involved.

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

What do you mean by the optical activity of certain substances ? Give two examples of optically
active substances,

Mention the applications of holography.
What do you mean by a graded index fiber ? Draw its refractive index profile.
What do you mean by pulse dispersion in optical fiber ?
(Ceiling - 20 marks)

Turn over

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