LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – PHYSICS

FIFTH SEMESTER – APRIL 2012

PH 5509/PH 5506/PH 3500 – OPTICS

 

 

 

Date : 30-04-2012              Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

 

PART – A

 

Answer ALL questions:                                                                                                       (10 x 2 = 20 marks)                                       

1. What are nodal planes?  When do nodal points coincide with the principal points?
2. What is Abbe’s sine condition?  Where is it applied?
3. What is the principle behind the appearance of beautiful colors produced by the thin film of soap bubble?
4. What is fringe width?
5. What is a zone plate? In which aspect is it different from a convex lens?
6. What is grating element? Write one use of grating
7. If the refractive index of glass is 1.5, what is the angle of polarization?
8. Which type of crystals exhibit double refraction? why? Give an example
9. Write down any four characteristics of laser beam?
10. Differentiate between spontaneous emission and stimulated emission

 

PART – B

Answer any FOUR questions:                                                                     [4 x 7.5 = 30 marks]

 

1. Compare and contrast Huygen’s eyepiece and Ramsden’s eye piece.
2. The width of the fringes obtained on a screen kept at a distance 80 cm from a biprism is 9.424 x 10 ^{– 8} cm. What is the distance between the two coherent sources if the wave length of sodium light used is 5890 A⁰?
3. What is Rayleigh’s criterion for the resolution of spectral lines? Obtain an expression for the resolving power of a telescope.
4. How would you produce, detect [a] plane polarized and [b] circularly polarized light?
5. What is non linear optics? Explain how second harmonics are generated?

 

 

 

 

PART – C

Answer any FOUR questions:                                                                     [4 x 12.5 = 50 marks]

 

1. [a] Define the term dispersive power. [b] Explain how two narrow angled prisms of different dispersive powers may be combined to produce [i] dispersion without deviation and [ii] deviation without dispersion.
2. With the neat diagram, describe the construction and working of a Michelson’s interferometer and discuss its applications.
3. What is Fraunhofer diffraction? Discuss the Fraunhofer diffraction pattern due to a single slit and hence explain how the wavelength of light is determined using it.
4. What is optical activity? Outline the principle and working of a half shade polarimeter and explain how the specific rotation of glucose is determined using it.
5. With the neat diagram, explain the construction, principle of working , energy level diagram  and applications of He – Ne laser.

Go To Main Page

 

 

 

 

 

 

 

 

Latest Govt Job & Exam Updates:

View Full List ...