Date: June 2017
1) Question no 1 is compulsory .
2) Attempt any three question from Q.2 to Q.6.
Why the Newton’s rings are circular and fringes in wedge shaped film are straight?
Chapter: [7] Interference and Diffraction of Light
What is grating and grating element?
Chapter: [7] Interference and Diffraction of Light
The core diameter of 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
What is population inversion? Explain it’s significance in the operation of LASER.
Chapter: [8] Lasers
What is a divergence of a vector field? Express it in cartesian co-ordinate system.
Chapter: [10] Electrodynamics
What is meant by thin film? Comment on the colours in thin film in sunlight.
Chapter: [7] Interference and Diffraction of Light
An electron is accelerated through a potential difference of 18 kV in a colour TV cathode ray tube. Calculate the kinetic energy and speed of electron.
Chapter: [11] Charge Particle in Electric and Magnetic Fields
Derive the conditions of maxima and minima due to interference of light transmitted from thin film of uniform thickness.
Chapter: [7] Interference and Diffraction of Light
Difference between step index and graded index fibre.
An optical fibre has a numerical aperture of 0.20 and refractive index of cladding is 1.59. Determine the core refractive index and the acceptance angle for the fibre in water which has a refractive index of 1.33.
Chapter: [9] Fibre Optics
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 6000 Ao by means of a diffraction grating with 5000 lines/cm?
Chapter: [7] Interference and Diffraction of Light
Explain construction and working of He:Ne laser with neat label diagram.
Chapter: [8] Lasers
Explain cylindrical co-ordinate system.
State the transformation relation between cartesian and cylindrical co-ordinates.
Chapter: [10] Electrodynamics
Explain the concept of electrostatic focusing in electron impacts.
Chapter: [11] Charge Particle in Electric and Magnetic Fields
Two optically plane glass strips of length 10 cm are placed one over the other.A thin foil 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.
Chapter: [7] Interference and Diffraction of Light
With Newton’s ring experiment explain how to determine the refractive index of liquid.
Chapter: [7] Interference and Diffraction of Light
Using spherical co-ordinate systems calculate the area of a disc of radius 2 cm.
Chapter: [10] Electrodynamics
What are different techniques to synthesis nanomaterial?
Explain one of them in detail.
Chapter: [12] Nanoscience and Nanotechnology
With neat diagram explain construction and working of scanning electron microscope.
Chapter: [12] Nanoscience and Nanotechnology
Explain the construction and reconstruction of hologram with neat diagram.
Chapter: [8] Lasers
An electron is accelerated through a potential difference of 5 kV and enters a uniform magnetic field of 0.02 `(wb)/(m^2)` acting normal to the direction of electron motion.
Determine the radius of path.
Chapter: [11] Charge Particle in Electric and Magnetic Fields
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