Bh.Papers  Physics II 
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Question PAper May2017
TOTAL MARKS: 60 TOTAL TIME: 2 HOURS (1) Question1 is compulsory. (2) Attempt Any three from the remaining Five questions. (3) Assume data if required. (4) Figures to the right indicate full marks. Q1. Attempt Any Five of the following. 1(a) Why the newton’s rings are circular and fringes in wedge shaped film are straight?  Module no.1  (3M) 1(b) What is grating and grating element?  Module no.1  (3M) 1(c) The dore diameter of multimode step index fiber is 50 µm. The numerical aperture is 0.25. Calculate the number of guided notes at an operating wavelength of 0.75 µm.  Module no.3  (3M) 1(d) What is a population inversion state? Explain its significance in the operation of LASER.  Module no.2  (3M) 1(e) What is divergence of a vector field? Express it in Cartesian coordinate system.  Module no.4  (3M) 1(f) What do you mean by thin film? Comment on the colors in thin film in sunlight?  Module no.1  (3M) 1(g) An electron is accelerated through a potential difference of 18 kV in a color TV cathode ray tube. Calculate the kinetic energy and the speed of the election.  Module no.5  (3M) Q2. Attempt both 2(a) A derive the condition for maxima and minima due to interference of light transmitted from thin film of uniform thickness.  Module no.1  (8M) 2(b) Difference between step index graded index fibre. An optical fiber has a numerical aperture of 0.20 and a refractive index of cladding is 1.59. Determine the core refractive index and the acceptance angle for the fiber in water which has a refractive index of 1.33.  Module no.3  (7M) Q3. Attempt both 3(a) Explain the experimental method to determine the wavelength of spectral line using diffraction grating. What is the highest order spectrum which can be seen with monochromatic light of wavelength 6000Ao by means of diffraction grating with 5000 lines/cm?.  Module no.1  (8M) 3(b) Explain construction and working of He:Ne laser with neat label diagram.  Module no.2  (7M) Q4. Attempt All 4(a) Explain cylindrical coordinate system. State the transformation relation between Cartesian and Cylindrical coordinates.  Module no.4  (5M) 4(b) Explain the concept of electrostatic focusing in electron optics.  Module no.4  (5M) 4(c) Two optically plane glass strips of length 10 cm are placed one over the other. A thin foil oil of thickness 0.01 mm is introduced between them at one end to form an air film. If the light used has wavelength 5900 Ao find the separation between consecutive bright fringes.  Module no.1  (5M) Q5. Attempt All 5(a) With Newton’s ring experiment explain how to determine the refractive index of liquid?  Module no.1  (5M) 5(b) Using spherical coordinate systems calculate the area of a disc of radius 2cm.  Module no.4  (5M) 5(c) What are the different techniques to synthesis nanomaterial? Explain one of them in detail.  Module no.6  (5M) Q6. Attempt All 6(a) With a neat diagram explain construction and working of Scanning electron microscope.  Module no.6  (5M) 6(b) Explain the construction and reconstruction of Hologram with neat diagram.  Module no.2  (5M) 6(c) An electron is accelerated through a potential difference of 5 kV and enters a uniform magnetic field of 0.02 wb/m2 acting normal to the direction of electron motion. Determine the radius of the path.  Module no.5  (5M) Question Paper December2017
TOTAL MARKS: 60 TOTAL TIME: 2 HOURS (1) Question1 is compulsory. (2) Attempt Any three from the remaining Five questions. (3) Assume data if required. (4) Figures to the right indicate full marks. Q1. Attempt all the question it's compulsory. 1(a) Why the newton’s rings are circular and centre of interference pattern (reflected) is dark?  Module no.1  (3M) 1(b) What is Rayleigh’s criterion of resolution? Define resolving power of a grating?  Module no.1  (3M) 1(c) Calculate the V number of an optical fiber having numerical aperture 0.25 and core diameter 20 µm, if its operating wavelength is 1.55 µm.  Module no.3  (3M) 1(d) What is pumping in LASER? Give the type of pumping.  Module no.2  (3M) 1(e) Show that the divergence of the curl of a vector is zero.  Module no.4  (3M) 1(f) Determine the magnetic field required to bend a beam consisting of electrons of speed 3x102 m/s in a circle of radius 5 cm.  Module no.5  (3M) 1(g) What will the fringe pattern if wedge shaped air film is illuminated with white light?  Module no.1  (3M) Q2. Attempt both 2(a) Obtain the condition for maxima and minima of the light reflected from a thin transparent film or uniform thickness. Why is the visibility of the fringe much higher in the reflected system than in the transmitted system.  Module no.1  (8M) 2(b) What is numerical aperture? Explain the use of optical fiber in temperature sensor. The core diameter of a multimode step index fiber is 50 µm. The numerical aperture is 0.25. Calculate the number of guided modes at an operating wavelength of 0.75 µm.  Module no.3  (7M) Q3. Attempt both 3(a) Explain the experimental method to determine wavelength of spectral line using diffraction grating. A diffraction grating has 5000 line/cm and the total ruled width is 5 cm. Calculate dispersion for a wavelength of 5000 AO in the second order.  Module no.1  (8M) 3(b) Explain the construction and working of Nd: YAG laser.  Module no.2  (7M) Q4. Attempt both 4(a) Explain spherical coordinate system. State the transformation relation between Cartesian and Spherical coordinates.  Module no.4  (5M) 4(b) Explain construction and working of cathode ray tube.  Module no.5  (5M) 4(c) A wedge shaped air film having angle of 40 seconds is illuminated by monochromatic light. Fringes are observed vertically through microscope. The distance between 10 consecutive dark fringes is 1.2 cm. Find the wavelength of monochromatic light used.  Module no.1  (5M) Q5. Attempt Both 5(a) With neat diagram explain construction and working of Atomic force microscope.  Module no.6  (5M) 5(b) Derive maxwell’s two general equations in integral and differential form.  Module no.4  (5M) 5(c) An electron is accelerated through a potential difference of 5 kV and enters a uniform magnetic field of 0.02 wb/m2 acting normal to the direction of electron motion. Determine the radius of path.  Module no.5  (5M) Q6. Attempt All 6(a) What are the different techniques to synthesis nanomaterial? Explain one of them in detail.  Module no.6  (5M) 6(b) What is holography? Differentiate between holography and photography.  Module no.2  (5M) 6(c) Describe in detail the concept of anti reflecting film with a proper ray diagram.  Module no.1  (5M) QUESTION PAPER may  2018
TOTAL MARKS: 60 TOTAL TIME: 2 HOURS (1) Question1 is compulsory. (2) Attempt Any three from the remaining Five questions. (3) Assume data if required. (4) Figures to the right indicate full marks. Q1. Attempt all the question it's compulsory. 1(a) Explain how interference in wedge shaped film is used to test optical flatness of given glass plate.  Module no.1  (3M) 1(b) What is diffraction grating? What is the advantage of increasing the number of lines in the Grating?  Module no.1  (3M) 1(c) With neat ray diagram explain the concept of total internal reflection (TIR).  Module no.3  (3M) 1(d) Differentiate between spontaneous and stimulated emission.  Module no.2  (3M) 1(e) Find cylindrical coordinates of a point (3i+4j+k).  Module no.4  (3M) 1(f) In Newton's rings pattern what will be the order of the dark ring which will have double the diameter of the 40th dark ring.  Module no.1  (3M) 1(g) Draw the block diagram of cathode ray tube (CRT) and briefly explain functions of its parts.  Module no.5  (3M) Q2. Attempt All 2(a) Derive the conditions for maxima and minima due to interference of light reflected from thin film of uniform thickness.  Module no.1  (8M) 2(b) Derive the formula for numerical aperture of step index fibre and give its physical significance. The N.A. of an optical fibre is 0.5 and core refractive index is 1 54.Find the refractive index of cladding.  Module no.3  (7M) Q3. Attempt All 3(a) Discuss the Fraunhofer diffraction at single slit and obtain the condition for minima in plane transmission grating the angle of diffraction for second order prinçipal maxima for wavelength 5x10 5 cm is 35° Calculate number of lines/cm on diffraction grating.  Module no.1  (8M) 3(b) What is the difference between photography and holography? Explain holography technique to obtain 3D image of an object .  Module no.2  (7M) Q4. Attempt All 4(a) Find the divergence of vector field F=x²yzi+xzj.  Module no.4  (5M) 4(b) Explain how A.C. voltage and its frequency is measured using CRO.  Module no.5  (5M) 4(c) A wedge shaped air film having an angle of 40 seconds is illuminated by monochromatic light and fringes are observed vertically through a microscope. The distance measured between consecutive bright fringes is 0.12 cm. Calculate wavelength of light used.  Module no.1  (5M) Q5. Attempt All 5(a) Explain Newton's rings experiment and show that diameters of nth dark rings are proportional a square root of natural numbers .  Module no.1  (5M) 5(b) Write Maxwell's equations and give its physical significance.  Module no.4  (5M) 5(c) Explain construction and working of atomic force microscope.  Module no.6  (5M) Q6. Attempt All 6(a) Explain different types of carbon nanotubes and give its applications.  Module no.6  (5M) 6(b) Explain construction and working of Nd YAG laser  Module no.2  (5M) 6(c) Write a note on electrostatic focussing  Module no.4  (5M) QUESTION PAPER DECEMBER2018
TOTAL MARKS: 80 TOTAL TIME: 3 HOURS (1) Question1 is compulsory. (2) Attempt Any three from the remaining Five questions. (3) Assume data if required. (4) Figures to the right indicate full marks. Q1. Attempt any five. 1(a) Find the divergence of vector function ⊼=x2î+ x2y2ĵ+ 24x2y2z2ќ  Module no.4  (3M) 1(b) What is anti reflection coating? What should be the refractive index and minimum thickness of the coating  Module no.1  (3M) 1(c) A glass material A with which an optical fibre is made has a refractive index of 1.55. This material is clad with another material whose refractive index is 1.51. The light in the fibre is launched in air.calculate the numerical aperture of the fiber.  Module no.3  (3M) 1(d) What is the difference between bottom up approach and top down approach with respect to nano technology.  Module no. 6  (3M) 1(e) Write the difference between led and laser diode.  Module no. 1  (3M) 1(f) How is the lissajous figures used to measure unknown frequency?  Module no.4  (3M) 1(g) A parallel beam of light of wavelength 5890Å is incident on glass plate having refractive index μ=1.5 such that the angle of refraction in the plate is 60o. Calculate the smallest thickness of the glass plate which will appear dark by reflected light  Module no.1  (3M). Q2. Attempt all 2(a) With the help of a proper diagram and necessary expression, explain how newton’s ring expt. Is useful to determine the radius of curvature of a plano convex lens. In a newton’s ring expt. The diameter of 5th dark ring is 0.336cm and diameter of the 15th dark ring is 0.590cm. Find the radius of the plano convex lens. If wavelength of the light used is 5890Å.How is the lissajous figures used to measure unknown frequency?  Module no. 1  (8M) 2(b) What is monomode and multimode fibre? Explain the term V number. Calculate the number of modes a step of index optical fibre of diameter 40μm will transmit as its core and cladding refractive indices are 1.5 and 1.46 respectively. Wavelength of the light used is 1.5μm.  Module no. 3  (7M) Q3.Attempt all 3(a) With a neat energy level diagram describe the construction and working of HeNe laser. What are its merits and demerits?  Module no.2  (8M) 3(b) What is diffraction grating and grating element? Explain the experimental to determine the wavelength of spectral lines using diffraction grating.  Module no.1  (7M) Q4.Attempt all 4(a) With a neat diagram explain the construction and working of scanning electron microscope.  Module no.6  (5M) 4(b) Derive the bethe law for electron refraction  Module no.5  (5M) 4(c) Define the condition for absent spectra in grating  Module no. 1  (5M) Q5.Attempt all 5(a) Draw the block diagram of optical fibre communication system and explain the function of each block.  Module no.3  (5M) 5(b) Derive maxwell’s third equation.  Module no.4  (5M) 5(c) An electron enters a uniform magnetic field B 0.23X102wb/b2. At 45 degree angle to B. determine radius and the pitch of helical path. Assume electron path to be 3x107m/s. Module no.4  (5M) Q6.Attempt all 6(a) If Ā=x2zî2y2z2ĵ+ 24xy2zќ.Find ⊽, Ā at point(1,1,1).  Module no.4  (5M) 6(b) A newton’s ring setup is used with a source emitting two wavelengths λ1=6000Å and λ21=4500Å . determine the radius and the pitch of the helical path. It is found that nth dark ring due to 6000Å coincides with (n+2)th dark ring due to 4500Å.if the radius of the curvature of the lens is 90cm, find the diameter nth dark ring for 6000Å  Module no.1  (5M) 6(c) Differentiate between stimulated and spontaneous emission.  Module no.2  (5M) Module wise Marks Distribution may2017
Module wise marks distribution december  2017
MODULE WISE MARKS DISTRIBUTION MAY  2018
MODULE WISE MARKS DISTRIBUTION December  2018
Module wise questions distribution May 2017
Module wise questions distribution december  2017
MODULE WISE QUESTIONS DISTRIBUTION MAY  2018
MODULE WISE QUESTIONS DISTRIBUTION december  2018
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