Osmania University (OU) 2011-4th Year B.E Engineering Physics I Internal, 1/, Affiliated Vasavi College - Question Paper
DEPARTMENT OF PHYSICS
*'E K(all brand**) I lm*rrugl Eurnlrmiort 2011-12 Sub Engineering Phy*
Time. 1 Hour Mas Marks-20
Aniwar AO the Question In Part - A
And any Two Question* from Part -1
Part - A (3x2*6 Marks)
i An unpolarlsed light falls on two polarizing sheets. What must be the angle between characteristic direction! of the polarizer and analyser, If the Intensity of the transmitted light is one-third of the Incident beam?
2. An Optical fiber has HA of 0.2 and cladding refractive index of 1 59 Determine the erftieal angle and acceptance angle for the fiber in water (ft.i = i ll)
3 Explain the conditions under which th* stimulated mission dominates over spontaneous emission for lasmg action.
Part -1 (2x7=14 marte)
4 a) Explain double refraction with a neat diagram (2M] b) Explain the formation of Newton s ring* usmg a neat diagram
Obtain the diameter of n* dark rtng. (SMI
5. i) What <s an optical activity Define specific rotation [2Mj b) Oerive an expression for the intensity at a point in the diffraction produced by a double sltt Illuminated by a monochromatic light and draw the intensity
distribution curves fSMJ
ft a) Explain the prop*|*t1on of light through different types of optical fibers 13M)
b) Explain the construction and working of ftgby laser [4MI
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| Earning: Approval pending. |
