2017-2018 December

1) Question no **1 **is **Compulsary .**

2) Attempt any **three** questions from **Q ****. 2 to ****Q . 6.**

Why the Newton’s rings are circular and centre of interference pattern (reflected) is dark?

Chapter: [7] Interference and Diffraction of Light

What is Rayleigh’s criterion of resolution? Define resolving power of grating?

Chapter: [7] Interference and Diffraction of Light

Calculate the V number of an optical fibre having numerical aperture 0.25 and core diameter 20 μm, if its operating wavelength is 1.55 μm.

Chapter: [9] Fibre Optics

What is pumping in LASER? Give the types of pumping.

Chapter: [8] Lasers

Show that the divergence of curl of a vector is zero.

Chapter: [10] Electrodynamics

⦁ Determine the magnetic field required to bend a beam consisting of electrons of speed 3 × 10^{7 } m/s in a circle of radius 5 cm.

Chapter: [11] Charge Particle in Electric and Magnetic Fields

What will be the fringe pattern if wedge shaped air film is illuminated with white light?

Chapter: [7] Interference and Diffraction of Light

Obtain the condition for maxima and minima of the light reflected from a thin transparent film of uniform thickness. Why is the visibility of the fringe much higher in the reflected system than in the transmitted system.

Chapter: [7] Interference and Diffraction of Light

What is Numerical aperture? Explain the use of optical fibre in temperature sensor. The core diameter of a multimode step index fibre is 50 μm. The numerical aperture is 0.25. Calculate the number of guided modes at an operating wavelength of 0.75 μm.

Chapter: [9] Fibre Optics

Explain the experimental method to determine the wavelength of spectral lines using grating. A diffraction grating has 5000 lines / cm and the total ruled with is 5cm. Calculate dispersion for a wavelength of 5000 A0 in the second order.

Chapter: [7] Interference and Diffraction of Light

Explain construction and working of Nd: YAG laser.

Chapter: [8] Lasers

Explain spherical co-ordinate system. State the transformation relation between Cartesian and spherical co-ordinates.

Chapter: [10] Electrodynamics

Explain construction and working of cathode ray tube.

Chapter: [11] Charge Particle in Electric and Magnetic Fields

A wedge shaped air film having angle 40 seconds is illuminated by monochromatic light. Fringes are observed vertically through a microscope. The distance between 10 consecutive dark fringes is 1.2 cm. find the wavelength of monochromatic light used.

Chapter: [7] Interference and Diffraction of Light

With neat diagram explain construction and working of atomic force microscope.

Chapter: [12] Nanoscience and Nanotechnology

Derive Maxwell’s two general equations in integral and differential form.

Chapter: [10] Electrodynamics

an electron is accelerated through a potential difference of 5kv and enters a uniform magnetic field of 0.02 wb/m^{2} acting normal to the direction of electron motion. Determine radius of the path.

Chapter: [11] Charge Particle in Electric and Magnetic Fields

What are the different techniques to synthesise nanomaterial? Explain one of them in detail.

Chapter: [12] Nanoscience and Nanotechnology

What is holography? Differentiate between holography and photography.

Chapter: [8] Lasers

Describe in detail the concept of anti-reflecting film with a proper ray diagram.

Chapter: [7] Interference and Diffraction of Light

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