OU BSc Computer Science 2021 Important Question Bank || Osmania University (Important Questions)
Subject Title: Optics Prepared by: K. Ramya
Year: III Semester: IV Updated on: 25/03/
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Unit-1 Interference
- What is coherence? What are the types of coherence. Explain Lloyd’s mirror experiment.
- What are the conditions for Interference of light? Determine the thickness of a material Fresnel’s using biprism?
- Explain oblique incidence of a plane wave on a thin film due to reflected light (cosine law).
- Describe Michelson’s Interferometer with a neat diagram and explain types of fringes.
- Explain Newton’s rings in reflected light with & without contact between lens and glass plate?
- Describe in brief the determination wavelength of monochromatic light, difference in wavelength of sodium light & thickness of a thin transparent plate.
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Unit 2- Diffraction
- Write the differences between Fraunhoffer & Fresnel’ diffraction?
- Explain diffraction of grating by Fraunhoffer diffraction pattern with single, double, N slits?
- Explain Resolving power of grating & determination of wavelength in normal and oblique incidence methods.
- Explain the concept of Fresnel’s half period zones & phase reversal zone plate.
- Describe diffraction at straight edge & difference between Interference and diffraction.
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Unit 3- Polarisation
- Explain polarisation by reflection & refraction’& methods of polarisation.
- Explain Brewster’s law and show that the angle of polarisation(P) is equal to refractive index(µ).
- Explain about Nicol’s prism as a polariser and analyser?
- Explain the construction and working of Babinet’s compensation?
- Explain Laurent’s half-shade polarimeter?
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Unit 4- Aberrations and Fiber optics
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- Explain spherical aberration and method of minimising the spherical aberrations.
- Explain in detail about chromatic aberration?
- Explain different types of optical fibres? Explain their advantages & disadvantages.
- Explain rays and modes in an optical fibre?
- Explain briefly about astigmatism and how can we remove it?
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