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.

Concept: Wedge Shaped Film(Angle of Wedge and Thickness Measurement)

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

Concept: Diffraction Grating

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

Concept: Total Internal Reflection

Differentiate between spontaneous and stimulated emission.

Concept: Spontaneous Emission and Stimulated Emission

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

Concept: Cylindrical and Spherical Coordinate System

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

Concept: Newton’S Rings

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

Concept: Cathode Ray Tube (Crt)

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

Concept: Interference in Thin Film of Constant Thickness Due to Reflected and Transmitted 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.

Concept: Numerical Aperture

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.

Concept: Diffraction Grating

What is the difference between photography and holography?

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

Concept: Applications of Laser - Holography (Construction and Reconstruction of Holograms)

Find the divergence of vector field F=x2yz𝒊 ̅+ xz𝒋̅

Concept: Scaler and Vector Field

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

Concept: Application of Cro

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.

Concept: Wedge Shaped Film(Angle of Wedge and Thickness Measurement)

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

Concept: Newton’S Rings

Write Maxwell’s equation and give its physical significance.

Concept: Determination of Maxwell’S Four Equations

Explain construction and working of atomic force microscope.

Concept: Important Tools in Nanotechnology - Atomic Force Microscope

Explain different types of carbon nanotubes and give its applications.

Concept: Nano Materials - Properties and Applications of Nanomaterials

Explain construction and working of Nd:YAG LASER.

Concept: Spontaneous Emission and Stimulated Emission - Nd:Yag Lase

Write a note on electrostatic focusing.

Concept: Electrostatic Focusing

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