STUPIDSID
Attempt any five from the following:-
1 (a)
Explain the effect on Newton's rings when oil (μ = 1.65) is introduced between the lens (μ = 1.5) and the glass plate (μ = 1.75).
3 M
1 (b)
A grating has 620 rulings/mm and is 5.05mm wide. What is the smallest wavelength interval that can be resolved in the third order at λ = 481nm?
3 M
1 (c)
Explain the terms: Stimulated emission and Population inversion.
3 M
1 (d)
Calculate the De-Broglie wavelength of an electron whose kinetic energy is 120eV.
[me = 9.1x10-31kg, h = 6.63x10-34 J/sec].
[me = 9.1x10-31kg, h = 6.63x10-34 J/sec].
3 M
1 (e)
Distinguish between paramagnetic and ferromagnetic materials.
3 M
1 (f)
Differentiate between step-index fibre and graded-index fibre.
3 M
1 (g)
A magnetic material has magnetization of 2300 A/m and produces a flux density of 0.00314 Wb/m2. Calculate the magnetizing force H and relative permeability of the material.
3 M
2 (a)
Derive the conditions for a constant thickness film to appear bright and dark when being viewed in reflected light.
8 M
2 (b)
Describe the construction and working of a He-Ne laser with schematic and energy level diagrams.
7 M
3 (a)
What are anti-reflecting films? In costume jewelery, rhinestones (made of glass with μ = 1.5) are often coated with silicon monoxide (μ = 2.0) to make them more reflective. How thick should the coating be to achieve strong reflections for 560nm light, incident normally?
8 M
3 (b)
What is holography? Explain construction and reconstruction of a hologram.
7 M
4 (a)
Develop one dimensional time dependent Schrodinger equation for matter waves.
8 M
4 (b)
Discuss Weiss's theory of ferromagnetism and derive Curie-Weiss's law.
7 M
5 (a)
What is an optical resonator cavity? What role does it play in a laser beam?
5 M
5 (b)
A mild steel ring having a cross-sectional area of 5cm2 and mean diameter 20cm has a coil of 200 turns wound on it. Calculate the reluctance R and the current required to produce flux of 1mWb (μr = 380) neglecting air gap.
5 M
5 (c)
An electron moves in the x-direction with a speed of 1.88x106m/s. If this speed is measured to a precision of 1%, with what precision can you simultaneously measure its position?
5 M
6 (a)
Explain the working principle of pirani gauge?
5 M
6 (b)
Describe the working of scanning electron microscope (SEM) with diagram.
5 M
6 (c)
What are hard and soft magnetic materials? Explain these materials using their characteristic properties and applications.
5 M
7 (a)
What is meant by numerical aperture of an optical fibre? An optical fibre has a numerical aperture of 0.20. Determine the acceptance angle for the fibre in water (μ = 1.33).
5 M
7 (b)
A monochromatic light from He-Ne laser λ = 6328Å is incident normally on a diffraction grating having 6000 lines/cm. Find angles at which first and second order maxima would be observed.
5 M
7 (c)
Newton's rings are observed in reflected light of wavelength 5 x 10-5 cm. The diameter of 10th dark ring is 0.5cm. Calculate radius of curvature R and thickness of film t at the ring.
5 M
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