Interference and Diffraction Objective Question and Answer
Interference and Diffraction MCQ Multiple Choice Questions - Page 2 for Practice
Interference and Diffraction MCQ Questions for Practice
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?
Correct Answer is: All of above
17. In diffraction Fraunhofer diffraction pattern due to single slit central maxima is formed at center because
Correct Answer is: Light rays focused at the centre of the screen undergo constructive interference
18. In diffraction pattern of monochromatic light the bright bands formed are
Correct Answer is: of uniform intensity
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?
Correct Answer is: All the diffracted rays are parallel and focused by slit at a single point on screen
20. In Fraunhofer diffraction wave front used is
Correct Answer is: Plane
21. In Fraunhofer diffraction, the incident wave front should be
Correct Answer is: Plane
22. In Fresnel diffraction
Correct Answer is: source of light is kept at finite distance from the aperture
23. In interference experiment, by keeping all other parameters constant, if you see the thin film interference from different angles, you will observe
Correct Answer is: Few colored bands and then general illumination
24. In interference experiment, monochromatic light is replaced by white light, we will see
Correct Answer is: Few colored bands and then general illumination
25. In Michelson interferometer semi silvered mirror is used to obtain
Correct Answer is: Phase coherence
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
Correct Answer is: 5890 Ao
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
Correct Answer is: 5880 Ao
28. In Newtons Ring experiments, the diameter of bright rings is proportional to
Correct Answer is: Square root of Odd Natural numbers
29. In Newtons Ring experiments, the diameter of dark rings is proportional to
Correct Answer is: 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)?
Correct Answer is: Radius (or diameter) will increase
