LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

   B.Sc. DEGREE EXAMINATION – PHYSICS

CC 11

FIFTH SEMESTER – November 2008

PH 5506 – OPTICS

 

 

 

Date : 07-11-08                     Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

PART – A              

Answer all questions.                                                                                       (10×2=20marks) 

 

1. What are unit planes ?
2. Give the condition for achromatic combination of lenses.
3. Calculate the separation between the coherent sources formed by a

biprism whose inclined faces make angles of 2⁰  with its base, the slit

being .1m away from the biprism. (Refractive index of prism material =

1.5)

4. How optical planeness of a surface is tested ?
5. Distinguish between Fresnel and Fraunhoffer diffraction.
6. What are missing orders in double slit experiment ?
7. State Brewster’s law.
8. Calculate the thickness of a half-wave plate for light of wavelength

580nm. Principal refractive indices are    = 1.544 and    =1.553.

9. What is optical pumping ?
10. What is Stimulated Raman scattering ?

 

PART – B

Answer any four questions.                                                                         (4×7.5=30marks)

 

11. Define dispersive power of a prism. Derive the Condition for

dispersion without deviation.

12. Discuss the formation of colours in thin films due to reflected light.
13. Describe the Fresnel’s diffraction at a straight edge.
14. Explain how Nicol prism can be used as an analyzer.
15. Define Einstein’s coefficients and derive the relation between them.

 

PART – C

Answer any four questions.                                                                 (4×12.5=50marks)

 

16. a) Discuss the effect of refraction on a ray of light by the matrix method.               (6.5)
17. b) Describe the Construction and working of Huygen’s eye piece.                             (6)
18. Describe Michelson’s interferometer with the help of line diagram.

Explain how  the wavelength of monochromatic light is measured using this.

18. Discuss the theory of diffraction grating. Obtain an expression for resolving power of a

grating.

19. a) With necessary theory explain the Construction and working of a Laurent’s half shade

Polarimeter.                                                                                                                (9)

1. b) A glucose solution of unknown Concentration is contained in a 12cm long tube and

seen to rotate linearly polarized light by 2.5 If the specific rotation of  glucose is 52

find the Concentration of a solution.                                                                                           (3.5)

20. With a neat diagram explain the working of a ruby laser.

 

 

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