Bh.Papers  Physics II 
Revised 2016 Syllabus Papers 

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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 nano material? 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) Module wise Marks Distribution may2017
Module wise questions distribution May 2017
analysis report for 2018
Module wise marks, priority and questions prediction  2018

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