Interference and Diffraction MCQ Multiple Choice Questions

Q: 2. Diffraction due to circular aperture If a light passes through a small pinhole, and incident on a screen. What will be observed on the screen?

Correct Answer is: A diffused bright point

Q: 3. Diffraction is special type of

Correct Answer is: Polarization

Q: 4. Extended source is needed in

Correct Answer is: None of them

Q: 6. For all transparent material substances, the index of refraction

Correct Answer is: Could be any of the given answers; it all depends on optical density

Q: 7. Fraunhofer diffraction at a Plane Grating. What is the meaning of grating element for a diffraction grating?A It is the width of a single slit

Correct Answer is: It is the distance between two slits

Q: 8. Fraunhofer diffraction is observed when

Correct Answer is: neither source nor screen is at finite distance

Q: 9. Fresnels type diffraction is observed when

Correct Answer is: Neither source nor screen is at finite distance

Q: 10. Fringe spacing is defined as the distance between two Consecutive

Correct Answer is: Bright or dark fringes

Q: 11. How the intensity of secondary maxima varies in case of Fraunhofer diffraction pattern for single slit?

Correct Answer is: Intensity of secondary maxima increases on either sides

Q: 12. If we narrow the distance between two slits in Youngs experiment the fringes width

Correct Answer is: becomes zero

Welcome to our Interference and Diffraction MCQs section, designed to help students and exam aspirants master these fundamental concepts in physics. Whether you're preparing for school exams, competitive tests, or job interviews, these multiple-choice questions are essential for your success.

About Interference and Diffraction MCQ Questions

Interference and Diffraction MCQs cover key concepts such as wave interference, diffraction patterns, and the behavior of light waves. These questions are crafted to test your understanding of how waves interact and how they diffract when passing through narrow openings or around obstacles.

Why Practice Interference and Diffraction Objective Questions?

Practicing these objective questions helps you solidify your knowledge, prepare for various exams, and enhance your problem-solving skills. They are particularly useful for revising core concepts, boosting confidence, and ensuring you are well-prepared for both academic and professional challenges.

Who Should Use These MCQs?

Interference and Diffraction MCQ Questions for Practice

1. Colors in thin films are because of

Dispersion
Compton effect
Interference
Diffraction

2. Diffraction due to circular aperture If a light passes through a small pinhole, and incident on a screen. What will be observed on the screen?

A sharp bright point of the width equal to width the pinhole
A bright point of the width equal to width the pinhole but of less intensity
A bright ring at the centre surrounded by alternate dark and bright rings
A diffused bright point

3. Diffraction is special type of

Reflection
Refraction
Interference
Polarization

4. Extended source is needed in

Youngs double slit experiment
Bi prism Experiment
Newtons Ring Experiment
None of them

5. Find the maximum value of resolving power of a grating 3 cm wide having 5000 lines per cm, if the wavelength of light used is 5890 A^o.

40000
45000
4500
5000

6. For all transparent material substances, the index of refraction

is less than 1
is greater than 1
is equal to 1
Could be any of the given answers; it all depends on optical density

7. Fraunhofer diffraction at a Plane Grating. What is the meaning of grating element for a diffraction grating?A It is the width of a single slit

It is the width of the opaque space
It is the distance between two slits
It is the width of diffraction grating

8. Fraunhofer diffraction is observed when

Only screen is placed at finite distance
source is placed at finite distance
neither source nor screen is at finite distance
None of these

9. Fresnels type diffraction is observed when

Only screen is placed at finite distance
Only source is placed at finite distance
Both source and screen are at finite distance
Neither source nor screen is at finite distance

10. Fringe spacing is defined as the distance between two Consecutive

Crests
Bright fringes only
Dark fringes only
Bright or dark fringes

11. How the intensity of secondary maxima varies in case of Fraunhofer diffraction pattern for single slit?

Intensity of secondary maxima decreases on either sides
Intensity of secondary maxima remains constant on either side
Intensity increases and decreases alternately
Intensity of secondary maxima increases on either sides

12. If we narrow the distance between two slits in Youngs experiment the fringes width

Increases
Decreases
Remains same
becomes zero

13. If you look perpendicular at thin film and move yourself away from the film (staying perpendicular to the film), you will notice

Reflected light becomes brighter and brighter
Reflected light becomes darker and darker
Reflected light alternates between darker and brighter
None of the Above

14. In a longitudinal wave

The particles move parallel to the direction of the wave motion.
The particles move perpendicular to the direction of the wave motion.
Energy causes the particles to move forward with the wave.
Energy is propagated by crests and troughs.

15. In a Youngs double-slit experiment the center of a bright fringe occurs wherever waves from the slits differ in the distance they travel by a multiple of

a fourth of a wavelength
a half a wavelength
a wavelength
three-fourths of a wavelength

16. In case of thin film of non-uniform thickness, when illuminated with white light, the film appears colored. This is due to change of what factor?

Conditions for path difference at different points of film
Change in optical path difference at different points of film
Thickness of film is different at different points of film
All of above

17. In diffraction Fraunhofer diffraction pattern due to single slit central maxima is formed at center because

Lens focuses all the diffracted rays at the centre of the slit
Slit focuses all the diffracted rays at the centre of the slit
Light rays focused at the centre of the screen undergo constructive interference
Slit and lens both combined focuses the rays at the centre of the slit

18. In diffraction pattern of monochromatic light the bright bands formed are

of uniform intensity
of non-uniform intensity
of uniform width
is of different colors

19. In Fraunhofer diffraction pattern for single slit, a central maximum is obtained when angle of diffraction q is equal to zero. What it actually indicates?

All the diffracted rays are parallel and focused by slit at a single point on screen
All the diffracted rays are perpendicular and focused by slit at a single point on screen
The rays are diffracted by the slit in all the directions
The rays are reflected by the slit

20. In Fraunhofer diffraction wave front used is

Spherical
Circular
Plane
Conical

21. In Fraunhofer diffraction, the incident wave front should be

elliptical
Plane
Spherical
Cylindrical

22. In Fresnel diffraction

source of light is kept at infinite distance from the aperture
source of light is kept at finite distance from the aperture
Convex lens used
aperture width is selected so that it can acts as a point source

23. In interference experiment, by keeping all other parameters constant, if you see the thin film interference from different angles, you will observe

Uniform illumination of screen
Uniform darkness on the screen
Equally spaced dark and white bands
Few colored bands and then general illumination

24. In interference experiment, monochromatic light is replaced by white light, we will see

Uniform illumination of screen
Uniform darkness on the screen
Equally spaced dark and white bands
Few colored bands and then general illumination

25. In Michelson interferometer semi silvered mirror is used to obtain

Thin film interference
Phase coherence
mono chromatic light
colored fringe

26. In Michelson s interferometer 100 fringes cross the field view when the movable mirror is displaced through 0.0248 mm. Calculate the wavelength of monochromatic light used

5896 A^o
5890 A^o
4000 A^o
4890 A^o

27. In Newtons ring experiment, the diameter of the 15 th ring was found to be 0.590 and that of the 5th ring was 0.336 cm. If the radius of Plano convex lens is 100 cm, compute the wavelength of light used

5885 A^o
5880 A^o
5890 A^o
5850 A^o

28. In Newtons Ring experiments, the diameter of bright rings is proportional to

Square root of Odd Natural numbers
Natural Number
Even Natural Number
Square root of natural number

29. In Newtons Ring experiments, the diameter of dark rings is proportional to

Odd Natural numbers
Natural Number
Even Natural Number
Square root of natural number

30. In Newtons rings experiment, if monochromatic source of light is replaced by another monochromatic source of higher wavelength. What will be the effect on radius (or diameter)?

Radius (or diameter) will decrease
Radius (or diameter) will increase
There will be no effect
Radius (or diameter) will remain constant but there will be more brightness

Interference and Diffraction MCQ Multiple Choice Questions for Practice

About Interference and Diffraction MCQ Questions

Why Practice Interference and Diffraction Objective Questions?

Who Should Use These MCQs?

Interference and Diffraction MCQ Questions for Practice

1. Colors in thin films are because of

2. Diffraction due to circular aperture If a light passes through a small pinhole, and incident on a screen. What will be observed on the screen?

3. Diffraction is special type of

4. Extended source is needed in

5. Find the maximum value of resolving power of a grating 3 cm wide having 5000 lines per cm, if the wavelength of light used is 5890 A^o.

6. For all transparent material substances, the index of refraction

7. Fraunhofer diffraction at a Plane Grating. What is the meaning of grating element for a diffraction grating?A It is the width of a single slit

8. Fraunhofer diffraction is observed when

9. Fresnels type diffraction is observed when

10. Fringe spacing is defined as the distance between two Consecutive

11. How the intensity of secondary maxima varies in case of Fraunhofer diffraction pattern for single slit?

12. If we narrow the distance between two slits in Youngs experiment the fringes width

13. If you look perpendicular at thin film and move yourself away from the film (staying perpendicular to the film), you will notice

14. In a longitudinal wave

15. In a Youngs double-slit experiment the center of a bright fringe occurs wherever waves from the slits differ in the distance they travel by a multiple of

16. In case of thin film of non-uniform thickness, when illuminated with white light, the film appears colored. This is due to change of what factor?

17. In diffraction Fraunhofer diffraction pattern due to single slit central maxima is formed at center because

18. In diffraction pattern of monochromatic light the bright bands formed are

19. In Fraunhofer diffraction pattern for single slit, a central maximum is obtained when angle of diffraction q is equal to zero. What it actually indicates?

20. In Fraunhofer diffraction wave front used is

21. In Fraunhofer diffraction, the incident wave front should be

22. In Fresnel diffraction

23. In interference experiment, by keeping all other parameters constant, if you see the thin film interference from different angles, you will observe

24. In interference experiment, monochromatic light is replaced by white light, we will see

25. In Michelson interferometer semi silvered mirror is used to obtain

26. In Michelson s interferometer 100 fringes cross the field view when the movable mirror is displaced through 0.0248 mm. Calculate the wavelength of monochromatic light used

27. In Newtons ring experiment, the diameter of the 15 th ring was found to be 0.590 and that of the 5th ring was 0.336 cm. If the radius of Plano convex lens is 100 cm, compute the wavelength of light used

28. In Newtons Ring experiments, the diameter of bright rings is proportional to

29. In Newtons Ring experiments, the diameter of dark rings is proportional to

30. In Newtons rings experiment, if monochromatic source of light is replaced by another monochromatic source of higher wavelength. What will be the effect on radius (or diameter)?

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Interference and Diffraction MCQ Multiple Choice Questions for Practice

About Interference and Diffraction MCQ Questions

Why Practice Interference and Diffraction Objective Questions?

Who Should Use These MCQs?

Interference and Diffraction MCQ Questions for Practice

1. Colors in thin films are because of

2. Diffraction due to circular aperture If a light passes through a small pinhole, and incident on a screen. What will be observed on the screen?

3. Diffraction is special type of

4. Extended source is needed in

5. Find the maximum value of resolving power of a grating 3 cm wide having 5000 lines per cm, if the wavelength of light used is 5890 Ao.

6. For all transparent material substances, the index of refraction

7. Fraunhofer diffraction at a Plane Grating. What is the meaning of grating element for a diffraction grating?A It is the width of a single slit

8. Fraunhofer diffraction is observed when

9. Fresnels type diffraction is observed when

10. Fringe spacing is defined as the distance between two Consecutive

11. How the intensity of secondary maxima varies in case of Fraunhofer diffraction pattern for single slit?

12. If we narrow the distance between two slits in Youngs experiment the fringes width

13. If you look perpendicular at thin film and move yourself away from the film (staying perpendicular to the film), you will notice

14. In a longitudinal wave

15. In a Youngs double-slit experiment the center of a bright fringe occurs wherever waves from the slits differ in the distance they travel by a multiple of

16. In case of thin film of non-uniform thickness, when illuminated with white light, the film appears colored. This is due to change of what factor?

17. In diffraction Fraunhofer diffraction pattern due to single slit central maxima is formed at center because

18. In diffraction pattern of monochromatic light the bright bands formed are

19. In Fraunhofer diffraction pattern for single slit, a central maximum is obtained when angle of diffraction q is equal to zero. What it actually indicates?

20. In Fraunhofer diffraction wave front used is

21. In Fraunhofer diffraction, the incident wave front should be

22. In Fresnel diffraction

23. In interference experiment, by keeping all other parameters constant, if you see the thin film interference from different angles, you will observe

24. In interference experiment, monochromatic light is replaced by white light, we will see

25. In Michelson interferometer semi silvered mirror is used to obtain

26. In Michelson s interferometer 100 fringes cross the field view when the movable mirror is displaced through 0.0248 mm. Calculate the wavelength of monochromatic light used

27. In Newtons ring experiment, the diameter of the 15 th ring was found to be 0.590 and that of the 5th ring was 0.336 cm. If the radius of Plano convex lens is 100 cm, compute the wavelength of light used

28. In Newtons Ring experiments, the diameter of bright rings is proportional to

29. In Newtons Ring experiments, the diameter of dark rings is proportional to

30. In Newtons rings experiment, if monochromatic source of light is replaced by another monochromatic source of higher wavelength. What will be the effect on radius (or diameter)?

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5. Find the maximum value of resolving power of a grating 3 cm wide having 5000 lines per cm, if the wavelength of light used is 5890 A^o.