BSc Sem IV 2014 2015 2015 Phy L Question Paper - Mumbai University | munotes

Questions asked in this paper

1. Q1 Attempt the following: 20)
   • A) Explain the Fraunhoffer diffraction at a single slit show that: secondary maxima
   • A) Give an account of Fresnel’s theory of diffraction at a straight edge. Explain the pattern on the basis of Fresnel’s half period Discuss the Fraunhoffer double slit diffraction phenomenon .Show that the separation between any two consecutive minima or maxima is equal to
   • B) Explain Huygen-Fresnel’s theory of diffraction
   • C) Distinguish between prism spectrum and grating
   • C) Determine the number of lines in lem of the grating su rface when a plane transmi grating diffracts second order through for incident light of wavelength Attempt the following: 7 A) Discuss theoretically the superposition of two linearly polarized light waves propagating in the same direction having same frequency when the optical parallel to each L d A) Give the mathematical analysis of the superposition
   • B) Explain the phene mena of double refraction on | he bast > of Huygen s half we plate for the Fraunhoffer line of wavel igth will determine the
   • A) Using a Michelson -Interferometer explain how you transparent plate of refractive index that for a plane transmission grating circular & straight fringes in Michelson- Interferometer
   • B) Explain the Formation of circular & straig
   • B) Describe Michelson-Interferometer how will you use it to calibrate
   • C) A telescope of 20cm objective is focused towards the moon at a distan the moon, if they are just resolvec Determine the distance between the two objects on the
   • C) Determine the resolving power of telescope which has an objective lens of 300 ine diameter, for a light of wavelength 6000A
2. Q4 Attempt the following: ( any three) [1 >}
   • A) What is mean by Polarization of light? Explain. ,
   • B) A grating fully resolves the two lines whose wavelengths are 5890A & 5896A in the second order. Find the minimum number of lines in a grating
   • C) Ina Fabry-Perot interferometer: if the length of etalon is 1.2cm. Find the free range in the wavelength region
   • D) A grating has 5000 line/em & they are ruled over a width of is the wavelength difference that could be resolved in the region of light cm in the first
   • E) A grating has 2500 lines/em. How many orders will be visible if a light of 5000A is incident normally on it?
   • F) A narrow slit is illuminated by light of wavelength laced at a distance of 0. Im froma straight edge. If the distance between the first and ; d dark band is 0.7786x10-3 Determine the wavelength of the source if he screen is at 0.5m away from the

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