Discuss the Faraday ’ s law of electromagnetic induction. -B 11. a) Deduce the missing orders for a double slit fraunhoffer diffraction pattern, if the slit widths are 0.16 mm and they are 0.8 mm apart. (2) b) Explain the formation of spectra by plane diffraction grating. What are its main characteristics ? (6) 2|M- - 590 12. Distinguish between plane polarized, circularly polarized and elliptically polarized light. How can circularly and elliptically polarized lights be produced. Explain briefly how will you determine whether a beam of light is unpolarized, plane polarized, circularly polarized and elliptically polarized ? (8) 13. a) What are the comp onents of optical communication. Why optical fiber is considered as best channel for optical communication ? Describe the types of optical fibers. (6) b) An optical fiber has a core material of refractive index of 1.55 and cladding material of refractive index 1.50. The light is launched into the fiber from air. Calculate its numerical aperture. (2) 14. a) Describe the construction and working of a He - Ne laser with necessary diagram . (6) b) Find the relative populations of the two states in a ruby laser that produces a light beam of wavelength 6943 A at 300K. (2) -C 15. a) An infinitely long wire has linear charge density 2 × 10 – 6 C/m. calculate the intensity of the electric field at a point 10 cm normal to the length of the wire. (3) b) the use of hysteresis curve. What type of magnetic material is suitable for transformer cores, telephone diaphragm and chokes. (5) 16. a) Derive Classius - Mossotti equation for non - polar dielectrics. (5) b) Calculate the induced dipole moment per unit volu me of He gas if placed in a field of 6000 V/cm. the atomic polarisability of He is 0.18 × 10 – 40 farad m 2 and density of He is 2.6 × 1025 atoms per m

Also calculate the separation between the centres of positive and negative charges. (3) 17. State Schrodi nger ’ s wave equation for a free particle in one dimensional closed box with infinitely hard walls. State the boundary conditions and solve it to obtain the normalized wave function for the particle. (8) 18. a) Describe with necessary theory Davisson and Ge rmer experiment for establishing wave nature of the electron. (6) b) What is the effect of increasing the electron energy on the scattering angle in Davisson and Germer experiment ? (2) NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any page of Answer Sheet will lead to UMC against the Student