Physical Optics-Interference [Optionals IAS Mains Physics]: Questions 1 - 6 of 7

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Question 1

Interference
Interference of Light-Young's Experiment
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Appeared in Year: 2013 (IFS)

Describe in Detail

Essay▾

In a double slit interference experiment, show that the fringe shape is hyerbola. (Section A)

Explanation

Young՚S Double Slit Set Up
  • In figure the arrangement of the Young՚s double slits experiment is shown. S is a narrow slit, from where a monochromatic light of wavelength is passing. Two other narrow slits and are there, which are far to each other of distance .
  • Light waves, which come out from slit S, fall on both and , and formed two coherent sou…

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Question 2

Interference
Multiple Beam Interference and Fabry-Perot Interferometer

Appeared in Year: 2002

Describe in Detail

Essay▾

A wave is represented by Find wavelength , velocity , Frequency and the direction of propagation. If it interferes with another wave given by find the amplitude and the phase of the resultant wave. (20 Marks)

Explanation

  • Meter.

    Angular frequency

    Frequency

    m/s

    Gives the direction of propagation.

  • As we have so is the direction of propagation.

    = resultant of two waves.

    … eq. (1)

    … eq. (2)

  • From equation (1) and (2)

  • Phase of resultant wave

    Resultant amplitude.

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Question 3

Interference
Interference of Light-Young's Experiment

Appeared in Year: 1999

Describe in Detail

Essay▾

What are the essential conditions for observing the interference of light? Two coherent sources with intensity ratio interfere. Find (20 Marks)

Explanation

It is not always necessary that two superimposing light waves always interfere and result in the redistribution of energy (fringes) . Only where these superimposing waves satisfy certain conditions the fringe pattern is observed on screen. These conditions are as follows:

  1. The phase difference between the two waves should not change with time. If the…

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Question 4

Interference
Holography and Simple Applications
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Appeared in Year: 2005

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Essay▾

Why does one get three – dimensional image is holography? Explain with appropriate figures how one can construct and read a hologram.

Explanation

Holography is a two step process. First step is the recording of hologram where the object is transformed into a photographic record and second step is the reconstruction in which the hologram is transformed into the image. Unlike in the conventional photography, lens isn՚t required in either of the steps. A hologram is the result of the interferen…

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Question 5

Interference
Michelson Interferometer
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Appeared in Year: 2017

Describe in Detail

Essay▾

Describe Michelson – Morley experiment and show low the negative results obtained from this experiment were interpreted. (Paper-1)

Explanation

Here is a source of monochromatic light, a parallel beam from which it falls upon a thin, parallel sided glass plate thinly silvered on the back surface. The incident beam is thus split up into two parts at right angles to each other and of equal intensity viz a reflected one and travelling upwards and a refracted one, travelling along the origin…

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Question 6

Interference
Interference of Light-Young's Experiment

Appeared in Year: 2009

Describe in Detail

Essay▾

Let By using analytical method, obtain an expression to explain interference. Also show that intensity varies along the screen in accordance with the law of cosine square in interference pattern. (Paper I Marks - 10)

Explanation

  • As given
  • When is the phase difference between them. According to Young՚s principle of superposition, the resultant electric field at any point P due to the simultaneous action of the two wave is given by

Eqn (1) shows that the superposition of two sinusoidal waves having the same frequency but with a phase difference produces a sinusoidal wave with…

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