PREVIOUS YEAR QUESTIONS-MODULE 1-ASSIGNMENT-1

Sree Narayana Guru College of Engineering and Technology, Payyanur
First Assignment 2007-2008
EN2K6 102: ENGINEERING PHYSICS
Answer any 10 of the following questions

1. A soap film 5x10-5 cm thick is viewed at an angle of 350 to the normal. Find the wavelength of light in the visible spectrum which will be absent from the reflected light. Given μ =1.33 (2006)
2. Discuss with necessary theory, the Newton’s rings experiment to determine the wavelength of sodium light. (2005)
3. Explain why the center of Newton’s rings is dark in the reflected system.(2007)
4. In a Newton’s rings system a convex lens of radius of curvature 1m is placed in contact with a flat plate. Calculate the radii of (1) the 3rd dark ring and (2) the 3rd bright ring of the interference pattern produced by the light of wavelength 5000 Å. (2004)
5. Explain how the wavelength of the sodium light is determined by forming wedge shaped air film. Derive the formula used. (2004,2007)
6. Explain how optical planeness of surfaces can be tested. (2006)
7. An air wedge of angle 0.01 rad is illuminated by monochromatic light of 600 nm falls normally on it. At what distance form the edge of the wedge will the 5th fringe be observed by the reflected light. (2007)
8. An air wedge of angle 0.01 rad is illuminated by monochromatic light of 6000 Å falls normally on it. At what distance form the edge of the wedge will the 10th fringe be observed by the reflected light. (2005)
9. Explain Fresnel’s and Fraunhoffer diffraction. (2004,2005)
10. Describe the theory of a plane transmission grating and describe how it is used to determine the wavelength of light. (2006,2007)
11. What is the highest order spectrum, which may be seen with monochromatic light of wavelength 6000 Å by means of a diffraction grating with 5000 lines/cm. (2006)
12. What are the differences between interference and diffraction bands?(2007)
13. Calculate the angular separation of two spectral lines of mercury of wavelengths 5770 Å and 5791 Å in the second order when a grating having 6x105 lines/m is used.(2007)
14. Describe double refraction in crystals. (2004,2007).
15. Write a brief note on half wave plate. (2006)
16. Explain how plane polarized light is produced and detected. (2005)
17. Write briefly how elliptically polarized light can be detected. (2005)
18. Explain with necessary theory the production and detection of circularly polarized light. (2004, 2005)
19. Calculate the specific rotation if the plane of polarization is turned through 26.40 traversing 20cm length of 20% sugar solution. (2004,2005)
20. Explain optical activity and specific rotation. Describe how half shade polarimeter is used to determine the specific rotation of glucose. (2006)
21. Write any four applications of polarized light. (2004)

LAST DATE FOR SUBMISSION: 10-01-2008