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+3--S-CBCS(MS)-Sc(H)-Core-V-Phy-R&B
2024
PART-I | Answer all the questions l 1x8
- In zone plate intensity of image increases as the focal length decreases. (TRUE/FALSE)
- In Fraunhoffer diffraction width of the central maximum is proportional to__ of light.
- In Fabry-perot interferometer fringes are formed due to the division of ____ .
- In Newton's ring fringe width decreases with the order of rings.(YES/NO)
- Oscilloscope is application of _____.
- Locus of the particles of the medium vibrating in _____ phase is known as wave front.
- Huygens's eyepiece is fully free from____ aberration.
- Refractive index x geometrical path = _____.
PART-II | within two to three sentences each | 1.5x8
- Write properties of wavefront.
- State Fermat's principle.
- The wavelength of sodium light in vacuum is 5890 °A. Find the frequency and wavelength of light in water (
).μ=1.33 - What is intensity of wave? Write its S.I. unit.
- Distinguish between plane wave and spherical wave.
- Write the conditions for constructive and destructive interference.
- Why are the Newton's rings circular?
- Two real sources of light cannot act as coherent sources. Explain.
- Find the radius of first zone of a zone plate of focal length 0.2m for a light of wavelength 5000 °A.
- What is resolving power of grating?
PART-III | within 75 words each |(2x8)
- Explain the rectilinear propagation of light.
- Explain visibility of fringes in Michelson's Interferometer.
- Explain Multiple Foci of a Zone plate.
- Interference obey's law of conservation of energy. Explain.
- Distinguish between Haidinger Fringes and Fizeau's fringes.
- The amplitude of two coherent waves are in the ratio 2:1. Due to superposition find the ratio of maximum and minimum intensities of the fringes produced.
- State the principle of superposition of N harmonic wave.
- Distinguish between particle velocity and wave velocity.
- A coaxial lens system placed in air has two lenses of focal lengths 3F and F separated by a distance 2F. Find the position first and second principle point.
- Distinguish between Temporal and spatial coherence.
PART-IV Answer within 500 words each | (6x4)
-
Describe the cardinal points and cardinal planes of an optical system.
OR
Using matrix method obtain the expression for equivalent focal length and position of cardinal points of Ramsden's eyepiece. -
Derive an expression for energy transport in a plane progressive wave.
OR
What is Lissajous figure? Derive an expression for superposition of two S.H.M. having frequency ration 1:1 analytically. -
Define Interference. Then derive an expression for Interference in wedge-shaped thin films.
OR
With neat diagram describe the principle, construction, and production of interference fringes with fabry-perot interferometer. -
Explain Fraunhoffer diffraction at a double slit. Then derive an expression for intensity distribution and find the positions of maxima and minima.
OR
Describe the Fresnel's theory of half period zones for plane waves using Fresnel's basic assumption.
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