2017-2018 June

1) Question no **1 **is **compulsory . **

2) Attempt any **three **question from no . **Q . 2 to** Q** . 6 .**

Explain how interference in wedge shaped film is used to test optical flatness of given glass plate.

Chapter: [7] Interference and Diffraction of Light

What is diffraction grating? What is the advantage of increasing the number of lines in the grating?

Chapter: [7] Interference and Diffraction of Light

With neat ray diagram explain the concept of total internal reflection (TIR).

Chapter: [9] Fibre Optics

Differentiate between spontaneous and stimulated emission.

Chapter: [8] Lasers

Find cylindrical co-ordinates of a point (3𝒊̅ + 4𝒋̅ + 𝒌̅)

Chapter: [10] Electrodynamics

In Newtons’s ring experiment,what will be the order of dark ring which will have double the diameter of 40th dark ring?

Chapter: [7] Interference and Diffraction of Light

Draw the block diagram of cathode ray tube and briefly explain its parts.

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

Derive the conditions of maxima and minima due to interference of light reflected from thin film of uniform thickness.

Chapter: [7] Interference and Diffraction of Light

Derive the formula for numerical aperture of step index fibre and give it’s physical significance.The N.A of of an optical fibre is 0.5 and the core refractive index is 1.54.Find the refractive index of cladding.

Chapter: [9] Fibre Optics

Discuss the Fraunhoffer diffraction at single slit and obtain the condition for minima.

In plane transmission grating the angle of diffraction for second order principal maxima for wavelength 5 x 10^{-5} is 35^{o}. Calculate number of lines/cm for this diffraction grating.

Chapter: [7] Interference and Diffraction of Light

What is the difference between photography and holography?

Explain holography technique to obtain 3D image of an object.

Chapter: [8] Lasers

Find the divergence of vector field F=x2yz𝒊 ̅+ xz𝒋̅

Chapter: [10] Electrodynamics

Explain how A.C voltage and its frequency is measured using CRO.

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

A wedged shaped air film having an angle of 40 seconds is illuminated by monochromatic light and fringes are observed vertically through a microscope. The distance measured between consecutive fringes is 0.12 cm. Calculate wavelength of light used.

Chapter: [7] Interference and Diffraction of Light

Explain Newton’s ring experiment and show that diameters of nth dark rings are proportional to square root of natural numbers.

Chapter: [7] Interference and Diffraction of Light

Write Maxwell’s equation and give its physical significance.

Chapter: [10] Electrodynamics

Explain construction and working of atomic force microscope.

Chapter: [12] Nanoscience and Nanotechnology

Explain different types of carbon nanotubes and give its applications.

Chapter: [12] Nanoscience and Nanotechnology

Explain construction and working of Nd:YAG LASER.

Chapter: [8] Lasers

Write a note on electrostatic focusing.

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

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## University of Mumbai previous year question papers Semester 2 (FE First Year) Applied Physics 2 with solutions 2017 - 2018

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