PHYSICS                                           [103 / 203]

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Class B. Tech. 1

Semester  Evaluation

Schedule per week

Examination Time = Three (3) Hours

Lectures      :  3

Maximum Marks = 100

Tutorial        :  1

[Mid-term (20) & End-term (80)]

Units  Contents of the Subject

Interference of Light

Preliminary:

[  Interference  as  superposition  of  waves  in  space.  Intensity  variation.  Bright  and  dark  fringes.

Fringe width. Conditions for observing interference of Light.]

•

Newton’s  Rings:  Theory  and  ex periment  for  determining  wavelength  of  light  and

refractive index of liquid

•

Michelson’s Interferometer: Production  of  circular &  straight  line  fringes, Determination

of  wavelength  of  light,  Determination  of  wavelength  separation  of  two  nearby

wavelengths

I

•

Interference  in  Optical  Technology:  elementary  idea  of  anti  reflection  coating  and

interference filters

Polarization of Light

•

Plane, circular and elliptically  polarized light on the  basis of electric (light) vector, Malus

Law

•

Double  Refraction:  Qualitative  description  of  refraction,  Phase  retardation  plates,

Quarter  and  half  wave  plates  construction  work ing and  use of these in  production  and

detection of circular and elliptically polarized light

•

Optical  Activity:  Optical  activity  and  law  of  optical  rotation,  Specific  rotation  and  its

measurement using the half shade and Bi-quartz devices

Diffraction of Light and Holography:

Preliminary: [Diffraction as a consequence of limiting wavefront. Fresnel’s and Fraunhofer’s

diffraction. Interference and Diffraction. Diffrac tion at single slit qualitative description.]

•

Single  Slit  Diffraction:  Quantitative  description  of  single  slit,  Positions  of  maxima  /

minima and width of central maximum, Intensity variation

•

Diffraction  Grating:  Construction  and  theory,  Formation  of  spectrum  by  plane

II

transmission grating,  Missing and overlapping  of spectra,  Determination of wavelength

of light using plane transmission grating

•

Resolving  Power:  Geometrical  &  Spectral,  Reyleigh  criterion,  Resolving  power  of

diffraction grating, Electron microscope and its resolving power

Holography

•

Holography  versus  photography,  Basic  theory  of  holography,  Basic  requirement  of  a

holographic laboratory

•

Applic ation of holography in microscopy and interferrometry

Coherence

•

Spatial  and  temporal  coherence,  Coherence  length,  Coherent  time  and  ‘Q’  factor  for

light

•

Visibility as a measure of coherence

•

Spatial coherence and size of the source

•

Temporal coherence and spectral purity

III

Lasers

•

Theory  of  Laser  Action:  Einstein’s  coefficients  components  of  a  laser,  Threshold

condition for laser action

•

Theory, design and application of He-Ne and Semiconductor lasers

•

Elementary ideas of Q-switching and mode locking

Optical Fibers

•

Optical fiber as optical wave guide