LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – PHYSICS

XC 52

FIFTH SEMESTER – April 2009

PH 5506 – OPTICS

 

 

 

Date & Time: 06/05/2009 / 1:00 – 4:00   Dept. No.                                                   Max. : 100 Marks

 

 

PART A

Answer all questions.                                                                                    (10 x 2 = 20)

 

1. What are Unit planes and Nodal planes?
2. What is achromatism?
3. What are coherent sources?
4. In Lloyd’s single mirror Interference experiment the slit source is at the distance of 2 mm from the plane of the mirror. The screen is kept at the distance of 2 m from the source. Calculate the fringe width. Wavelength  of light is 5896 A⁰ .
5. What is half period zone?.
6. State Rayleigh’s  criteria for just resolution.
7.  Write any two applications of Brewster’s Law?
8. A 100 mm long tube containing 48 cm³ of sugar solution produces an optical rotation of  13⁰ degree when placed in a saccharimeter.If the specific rotation of sugar solution is 66⁰,calculate he quatity of sugar contained in the tube in the form of a solution.
9. Write a short note on second Harmonic generation.
10. What do you mean by spontaneous and stimulated emission?

 

PART B

Answer any FOUR Questions.                                                                    (4 x 7.5 = 30)   

                                                                      

11. Derive Abbe,s sine condition for the elimination of spherical aberration and coma.
12. What is interference of light on its basis explain the color effects in thin films?
13. Find an expression for the resolving power of plane transmission grating.
14. Explain how a quarter wave plate functions to produce circularly and elliptically polarized

light..

15. Write note on threshold condition for lasing?.

 

PART C

Answer any FOUR questions.                                                                  (4 x 12.5 = 50)

 

16.a. Mention any six differences between Huygen’s and Ramsden’s  eyepieces.

1. A thick Biconvex lens having radii of curvature + 6 cm and -6 cm is made up of a

material of refractive index 1.6. If the thickness of the lens is 2 cm find

1. i) System Matrix
2. ii) Focal length

iii)Unit planes.

17. Describe the construction and working of Michelson interferometer. How will you

determine the wavelength of monochromatic light.

18)  Describe and explain the Fraunhofer pattern  obtained with the narrow slit and illuminated

by a parallel beam of mono chromatic light.

19) What is optical activity? Discuss the Fresnel’s explanation of Optical rotation..

20. Describe the construction and working f the Carbon dioxide laser.

 

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