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Michelson Interferometer Experiment Viva Questions

Determination of He-Ne Laser wavelength by using the M I Experiment 

It works on the interference principle. “What is the principle of Michelson Interferometer?” The Michelson Interferometer works on the interference principle. A beam splitter that is a semi silvered glass plate uses for this purpose. The two interfering waves construct the interference pattern. The circular pattern of fringes depends upon the uniform thickness between the two mirrors.

1Q. Define is Interference?

2Q. What is the condition for Interference?

3Q. Explain the LASER properties and what do you mean by a Coherent Source?

4Q. Why you are using the LASER (monochromatic source) why not bulb or sunlight, tube light?

5Q. What is the role of a semi-silvered glass plate and why one keep it at 45 degrees?

6Q. How do you think that a semi-silvered glass plate will look like?

7Q. Why do you keep compensating plate in the path of the light ray, is it transparent or semi-silvered plate?

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8Q.  Is compensating plate of the same thickness as of first one or varies place to place?

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Second Section

9Q. What is the relation between path difference and phase difference?

10Q. Which one is fixed mirror M1 or M2 in the Michelson Interferometer experiment?

11Q. M1 and M2 mirror are at 90 degrees or more?

12Q. Where forms the image of the M2 mirror by a semi-silvered glass plate?

Michelson interferometer experiment

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13Q. Where thin film of air forms and how?

14Q. How one can change the thickness of thin air film?

15Q. How the two light rays which satisfy the interfere condition at eyepiece forms?

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QUIZ for PRACTICE:

These are the questions:

1. What is the condition for colored Interference?

 The source should be monochromatic

 The source should be like Sun

 The source should be a LASER

 The source should be a red LED

2. How the velocity of light changes (once c-v and then c+v), what is the reason for it?

where c is the speed of light and v is the earth’s velocity.

 Light velocity changes relative to the speed of aether

 It remains constant

 c-v will be only due to the relative speed of the earth

 c+v will be only due to the relative speed of the earth

3. How do we observe a reflected and transmitted light beam from a monochromatic source?

 by using He-Ne laser

 by using semi silvered glass plate

 By using two mirrors

 By using two glass plates

4. At which angle M1 and M2 mirror are fixed?

 at 90 degrees

 at 60 degrees

 change the position according to the lab

 keep it generally at 60 degrees but it can vary according to the lab situation.

5. How one can change the thickness of thin air film?

 By moving the M1 mirror

 By moving the M2 mirror

 By moving the semi silvered glass plate

 By moving the transparent plate

6. Where thin film of air forms?

 in between M1 and M2(image)

 in between M2 and M1(image)

 at M2

 at eye piece

7. To find the path difference between light rays we use?

 reflected light from one mirror

 reflected light from two mirrors

 interference between two rays

 create a glass slab in between the mirrors

8. Which one is fixed mirror M1 or M2 in the Michelson Interferometer experiment?

 M1

 M2

 both are fixed

 both are movable

9. Why you are using the LASER (monochromatic source) why not bulb or sunlight, tube light?

 to get the circular fringes

 to get the black and white fringe pattern

 to satisfy the interference condition

 to get all the waves in the same phase

10. What is the condition to be Coherent Sources?

 the wavelength should be precisely defined of sources

 The frequency should be precisely defined of the sources

 All the waves should travel in a direction from all sources

 All the waves should start with the same phase from all sources

11. Where image forms of the M2 mirror by a semi-silvered glass plate?

 towards M1

 towards eye

 at the screen

 not sure

12. What about compensating plate thickness? is it of the same thickness as semi silvered or varies place to place?

 different

 it varies for a different color

 position matter where we fix it in apparatus

 same thickness

13. why do we keep a semi silvered glass plate at 45 degrees?

 light enters into the apparatus

 light breaks up into two parts before entering into the apparatus

 Light reflects at 90 degrees

 for interference

14. Why do you keep compensating plate in the path of the light ray, is it transparent or semi-silvered plate?

 To make light reflections, semi silvered plate,

 To make interference, semi silvered plate,

 To create path disturbance, transparent

 to make path equal, transparent

15. The two light waves in M.I. the experiment that satisfies the interference condition at eyepiece make a form?

 of random fringes

 of interference pattern as per the light source

 of circular fringes

 of maxima at different positions

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