BSc Physics SEM I ATKT 2016-17 ATKT PHYSICS II Question Paper - Mumbai University | munotes

Questions asked in this paper

• ii) Figures to the right indicate full marks

1. Q1 Answer the following:
   • A.a) Explain the refraction through a thick lens, Derive an expression for its focal length
   • b) Give the theory Of interference in thin flim. Derive an expression for the (8M]
   • a) What is the aberration of a lens? Explain why it arises ina lens. [7M]
   • b) Explain the method to minimize the spherical aberration. [7M]
   • C.a) planoconvex lens of focal length 2m and refractive index 1.5 is used to get newtons ings. Determine the radius of 10" bright ring by refraction if the wedge shaped air flim is normally by a light of wavelength 589nm
   • b)Two convex lens of focal length 15cm and 10cm are ata distance 8cm apart. What [5M] s the power of a combination?
2. Q2 Answer the following: - 20 marks
   • a) Give a brief account of application of laser. If a laser beam has a power of 30 m\W, find the ntensity of the spot. [8M]
   • b) Explain recording of the hologram and state the basic technique of holography [8M]
   • B. a) What is numerical aperture (NA) of an optical fibre? Derive necessary expression [7M]
   • b) Explain the light propagation through an optical fibre Write a short note on graded-index fibre
   • b) Give a brief account of application of laser. (20M
3. Q3 Answer the following: - { t law of thermodynamics,
   • b) Discuss the concept of Internal energy and obtain the firs is given by B, a) Show that the work done by a perfect gas In an adiabatic change IS [7M
   • b) What is critical coefficient? Show that its theoretical value is 2.667
   • C. a) Show that Van der Waals equation can be written as : | [SM]
   • b) Discuss the path dependence of work. [SM]
4. Q4 Answer the following. (Attempt any 3) [15 Marks}
   • a. Certain quantity of a perfect gas at compressed to one fourth of its large volume Calculate the resulting pressure and temperature (r=1.4)
   • b. Discuss the limitations of Van der Waals equation
   • c. Calculate the wavelength of light that incident normally on a wedge-shaped film of glass of 1.47. The angle of wedge is 30 seconds of an arc and the fringe
   • d. What are Lissagous figures? What factor do their shapes depend upon? A particle is subjected to two perpendicular SHM’s x= A cos wt cos(wt — Find trajectory of the particle
   • e. Explain properties of laser
   • f. Fringes of same thickness are observed ina thin glass wedge of 1.67. If the fringe spacing is 2 mm and wavelength of incident line 5890A, what is the angle of wedge in seconds of an arc?

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