Date: December 2017
1) Question no 1 is Compulsary .
2) Attempt any three questions from Q . 2 to Q . 6.
Why the Newton’s rings are circular and centre of interference pattern (reflected) is dark?
Chapter: [7] Interference and Diffraction of Light
What is Rayleigh’s criterion of resolution? Define resolving power of grating?
Chapter: [7] Interference and Diffraction of Light
Calculate the V number of an optical fibre having numerical aperture 0.25 and core diameter 20 μm, if its operating wavelength is 1.55 μm.
Chapter: [9] Fibre Optics
What is pumping in LASER? Give the types of pumping.
Chapter: [8] Lasers
Show that the divergence of curl of a vector is zero.
Chapter: [10] Electrodynamics
⦁ Determine the magnetic field required to bend a beam consisting of electrons of speed 3 × 107 m/s in a circle of radius 5 cm.
Chapter: [11] Charge Particle in Electric and Magnetic Fields
What will be the fringe pattern if wedge shaped air film is illuminated with white light?
Chapter: [7] Interference and Diffraction of Light
Obtain the condition for maxima and minima of the light reflected from a thin transparent film of uniform thickness. Why is the visibility of the fringe much higher in the reflected system than in the transmitted system.
Chapter: [7] Interference and Diffraction of Light
What is Numerical aperture? Explain the use of optical fibre in temperature sensor. The core diameter of a multimode step index fibre is 50 μm. The numerical aperture is 0.25. Calculate the number of guided modes at an operating wavelength of 0.75 μm.
Chapter: [9] Fibre Optics
Explain the experimental method to determine the wavelength of spectral lines using grating. A diffraction grating has 5000 lines / cm and the total ruled with is 5cm. Calculate dispersion for a wavelength of 5000 A0 in the second order.
Chapter: [7] Interference and Diffraction of Light
Explain construction and working of Nd: YAG laser.
Chapter: [8] Lasers
Explain spherical co-ordinate system. State the transformation relation between Cartesian and spherical co-ordinates.
Chapter: [10] Electrodynamics
Explain construction and working of cathode ray tube.
Chapter: [11] Charge Particle in Electric and Magnetic Fields
A wedge shaped air film having angle 40 seconds is illuminated by monochromatic light. Fringes are observed vertically through a microscope. The distance between 10 consecutive dark fringes is 1.2 cm. find the wavelength of monochromatic light used.
Chapter: [7] Interference and Diffraction of Light
With neat diagram explain construction and working of atomic force microscope.
Chapter: [12] Nanoscience and Nanotechnology
Derive Maxwell’s two general equations in integral and differential form.
Chapter: [10] Electrodynamics
an electron is accelerated through a potential difference of 5kv and enters a uniform magnetic field of 0.02 wb/m2 acting normal to the direction of electron motion. Determine radius of the path.
Chapter: [11] Charge Particle in Electric and Magnetic Fields
What are the different techniques to synthesise nanomaterial? Explain one of them in detail.
Chapter: [12] Nanoscience and Nanotechnology
What is holography? Differentiate between holography and photography.
Chapter: [8] Lasers
Describe in detail the concept of anti-reflecting film with a proper ray diagram.
Chapter: [7] Interference and Diffraction of Light
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