SUCCESS FOR CAREER

Physics

Unit-1

1.what is meant by interference of light?state the fundamental conditions for the production of interference fringers?
2.explain the principle of superposition of waves?
3.with releveant diagram explain yonges experiment on the basis of the wave theory?
4.explain why different colours are exhibited by a thin film when exposed to white light?
5.explain the interference of light duw to their films?
6.write the necessarary theory to determine the radius of a curvature of alens using newtons rings method?
Unit-2

1.DIFFERENCE BETWEEN INTERFERENCE AND DIFFRACTION?
2.discuss framhofer diffraction due to single slit?
3.find the angular widthof the central maximum in the transfer diffraction using a slit of width 1um when the slit is illuminated by light of wavwlength 600 nm?
4.find the highest order that can be seen with a having 15000 lines/inch.the wavelength of the light used is 600 nm?
5.a plane transimission graling having 6000 lines/cm is used to obtain a specrum of light from asodium lamp in the second order .calculate the angular spectrum between two sodium lines d1 and d2 of wavelength 5890a.v and 5896 a.v ?
6.explain rayleighs a criterion for resiving power of telescope?

Unit-3
1. Explain polarized light?
2. 2.discuss how the circular and ellipitical polarized light can be produced?
3.define the following?
a.plane of vibration.
b.palne of polarization.
4.what is brewsters law? Explain
5.expalian why the sky apeerrars blue and red at different times during a day?
6.calculate the thickness of a quqrter wave palte for amono chromatic light of wavelength 600nm.if the refractive indices of ordinary andextarordinaryrays in the medium are 1.5442 and 1.5533 respectively?
7.a beam of plane polarized light is converted into acircular polarized light by passing if through a crystal slice of thickness 3*10^-5. Calculate the difference in the refractive indices of the two rays inside the crystal assuming the above thickness to be the minimum value required to produce the observed effect.wavelength of the light used is 600 nm./
8.expalin in detail the term, double refraction?
9.discuss the construction of nicols prism?

Unit-4
1.define crystal lattice ,unitcell,lattice parameter and coordination number?
2.define coordination number and packing factor of a crystal?
3.expalin the terms
a.basis
b.space lattice
c.lattice paramers
d.unit cell.
4.describe the 3-dimensionalbravis lattices in combination with the crystal sysyem?
5.show that fcc is the model closely packed out of the three cubic structes by calculating the packing factors?
6.expalin the formation of ionic crystal with a suitable example? Structure of NACL?

Unit-5
1.what is miller indices?how arre they obtained
2.sketch the following planes of a cubic unit cell (001),(120),(211)
3.derive the expression for the inter planar spacing in the case of a cubic structure?
4.what is bragg’s law?expalin?
5.descibe laves method for the determination of crystal structure
6.descibe with suitable diagram the powder method for determination of crystal structure?

Unit-6
1.what is the characteristics of a laser beam?
2.explain with neat diagram
a.absorption
b.spontaneous emission
c.stimulated emission of radiation
3.derive the relation between probabilities of spontaneous emission and stimulated emission in terms of Einstein coefficients
4.calculate the wave length of emitted radiation from GaAs which has a brand gap of 1.44 e v
5.what is population inversion?
6.what is population inversion relating to laser action?explian
7.derive the construction and working of ruby laser with neat sketch?
8.expalin the need of a cavity resonator in alaser
9.with the help of a suitable diagrams explain the principle construction and working of a hellum=neon laser
10.describe the construction and working og GaAssemiconductor
11.write any four application of laser
12.differencebetweenn homo junction semiconductor and hetro junction semiconductor laser?

Unit-7
1.write the uses of fiber optics in different fibers?
2.desribe the different types of fibers by giving the refractive index profiles and propagationdetails?
3.distinguish between light propagation in
a.step index optical fiber
b.graded index optical fiber
4.an optical fiber has anumerical aperture of 0.20 and a cladding rexfractive index of 1.59 find the acceptance angle for the fiber in water which has refractive index of 1.33
5.explian the advantages of optical communication system
6.what are important features of optical fiber
7.derive the expressions for
a.acceptance angle
b.numerical aperture of an optical fibre
8.derive the communications process using optical fibre?
9.describe the construction of a typical optical fibre and give the dimensions of the various parts?

Unit-8
1.explin the basis principles involved in non destruction method of testing using ultrasonics?
2.explian pulse eche testing technique in the inspection of ultrasonic waves/
3.explian the inspection method of ultrasonic waves ?
4.what are the properties of ultrasonic waves/
5.list out the applications of ultrasonic waves?