# Applied Physics 2 CBCGS 2016-2017 BE Instrumentation Engineering Semester 2 (FE First Year) Question Paper Solution

Applied Physics 2 [CBCGS]
Date: June 2017

1) Question no 1 is compulsory .

2) Attempt any three question from Q.2 to Q.6.

 1
 1.A

Why the Newton’s rings are circular and fringes in wedge shaped film are straight?

Concept: Newton’S Rings
Chapter:  Interference and Diffraction of Light
 1.B

What is grating and grating element?

Concept: Diffraction Grating
Chapter:  Interference and Diffraction of Light
 1.C

The core diameter of 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.

Concept: Numerical Aperture
Chapter:  Fibre Optics
 1.D

What is population inversion? Explain it’s significance in the operation of LASER.

Concept: Spontaneous Emission and Stimulated Emission - Population Inversion
Chapter:  Lasers
 1.E

What is a divergence of a vector field? Express it in cartesian co-ordinate system.

Concept: Scaler and Vector Field
Chapter:  Electrodynamics
 1.F

What is meant by thin film? Comment on the colours in thin film in sunlight.

Concept: Interference in Thin Film of Constant Thickness Due to Reflected and Transmitted Light
Chapter:  Interference and Diffraction of Light
 1.G

An electron is accelerated through a potential difference of 18 kV in a colour TV cathode ray tube. Calculate the kinetic energy and speed of electron.

Concept: Cathode Ray Tube (Crt)
Chapter:  Charge Particle in Electric and Magnetic Fields
 2
 2.A

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

Concept: Interference in Thin Film of Constant Thickness Due to Reflected and Transmitted Light
Chapter:  Interference and Diffraction of Light
 2.B

Difference between step index and graded index fibre.
An optical fibre has a numerical aperture of 0.20 and refractive index of cladding is 1.59. Determine the core refractive index and the acceptance angle for the fibre in water which has a refractive index of 1.33.

Concept: Numerical Aperture
Chapter:  Fibre Optics
 3
 3.A

Explain the experimental method to determine the wavelength of spectral line using diffraction grating.
What is the highest order spectrum which can be seen with monochromatic light of wavelength 6000 Ao by means of a diffraction grating with 5000 lines/cm?

Concept: Diffraction Grating
Chapter:  Interference and Diffraction of Light
 3.B

Explain construction and working of He:Ne laser with neat label diagram.

Concept: Applications of Laser - Holography (Construction and Reconstruction of Holograms)
Chapter:  Lasers
 4
 4.A

Explain cylindrical co-ordinate system.
State the transformation relation between cartesian and cylindrical co-ordinates.

Concept: Cylindrical and Spherical Coordinate System
Chapter:  Electrodynamics
 4.B

Explain the concept of electrostatic focusing in electron impacts.

Concept: Electrostatic Focusing
Chapter:  Charge Particle in Electric and Magnetic Fields
 4.C

Two optically plane glass strips of length 10 cm are placed one over the other.A thin foil of thickness 0.01 mm is introduced between them at one end to form an air film.
If the light used has wavelength 5900 Ao,find the separation between consecutive bright fringes.

Concept: Diffraction of Light
Chapter:  Interference and Diffraction of Light
 5
 5.A

With Newton’s ring experiment explain how to determine the refractive index of liquid.

Concept: Newton’S Rings
Chapter:  Interference and Diffraction of Light
 5.B

Using spherical co-ordinate systems calculate the area of a disc of radius 2 cm.

Concept: Cylindrical and Spherical Coordinate System
Chapter:  Electrodynamics
 5.C

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

Concept: Nano Materials - Methods to Synthesize Nanomaterials
Chapter:  Nanoscience and Nanotechnology
 6
 6.A

With neat diagram explain construction and working of scanning electron microscope.

Concept: Important Tools in Nanotechnology - Scanning Electron Microscope
Chapter:  Nanoscience and Nanotechnology
 6.B

Explain the construction and reconstruction of hologram with neat diagram.

Concept: Applications of Laser - Holography (Construction and Reconstruction of Holograms)
Chapter:  Lasers
 6.C

An electron is accelerated through a potential difference of 5 kV and enters a uniform magnetic field of 0.02 (wb)/(m^2) acting normal to the direction of electron motion.

Concept: Motion of Electron in Magnetic Field
Chapter:  Charge Particle in Electric and Magnetic Fields

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