Interference and Diffraction Quiz | Interference and Diffraction Question and Answer for Practice

31. In Newtons rings experiment, if we reduce the radius of curvature of Plano convex lens to zero, what will be effect on Newtons rings?

1. They will become brighter
2. They will become darker
3. They will disappear
4. They will be more dense

32. In Newtons rings experiment, if we reduce the radius of curvature of PlanoConvex lens to zero, what will be effect on Newtons rings?

1. They will become more bright
2. They will become more dark
3. They will disappear
4. They will be more dense

33. In Newtons rings the central spot is

1. Always bright
2. always dark
3. can be bright or dark
4. of blue color

34. In plane transmission grating, the angle of diffraction for second order maxima for wavelength 5 x 10^-5 cm is 30 degree. Calculate the number of lines in one centimeter of the grating surface

1. 1000 lines/cm
2. 5000 lines/cm
3. 500 lines/cm
4. 10000 lines/cm

35. In reference with antireflection coating which of the following statement is true?

1. Thickness of the film should be changed for light of same wavelength but different intensity
2. Thickness of the film need not be changed for light of same wavelength but different intensity
3. Thickness of the film should be increased for light of same wavelength but higher intensity
4. Thickness of the film should be decreased for light of same wavelength but higher intensity

36. In reflected light the central fringes of Newtons ring is

1. dark
2. Bright
3. Uniform
4. Non uniform

37. In thin film of wedge shaped, by keeping all other parameters constant, if only wavelength of incident light is increased. What will be the effect on bandwidth?

1. Bandwidth increases
2. Bandwidth decreases
3. Bands will merge
4. There will not any effect

38. In wedge shaped film the interference pattern has nature

1. Parallel to the end where thickness is non-zero
2. Perpendicular to contact edge
3. Parallel to contact edge
4. Perpendicular to the end where thickness is non-zero

39. Interference in thin film is mainly because of

1. Division amplitude
2. Division of wave fronts
3. Addition of amplitude
4. Addition of wave fronts

40. Interference in thin film is mainly because of

1. Division amplitude
2. Division of wave fronts
3. Addition of amplitude
4. Addition of wave fronts

41. Interference of light is evidence that

1. The speed of light is very large
2. light is a transverse wave
3. light is electromagnetic in character
4. Light is a wave phenomenon

42. Interference pattern is observed in wedge-shaped film and bandwidth is noted. Now the angle of wedge is reduced to zero. What will be the effect on Bandwidth?

1. Bandwidth increases
2. Bandwidth decreases
3. Bands will disappear
4. There will not any effect

43. Interference pattern is observed in wedge-shaped film and bandwidth is noted. Now the angle of wedge is reduced. What will be the effect on bandwidth?

1. Bandwidth increases
2. Bandwidth decreases
3. Bands will disappear
4. There will not any effect

44. Interference pattern is observed in wedge-shaped film and bandwidth is noted. Now the thin film is replaced by the film of higher refractive index. What will be the effect on bandwidth?

1. Bandwidth increases
2. Bandwidth decreases
3. Bands will merge
4. There will not any effect

45. Interference pattern is observed in wedge-shaped film for monochromatic light. Now monochromatic light is replaced by white light. What will be the effect on interference pattern?

1. It will turn to dark
2. It will turn to bright
3. Bands will disappear
4. It will be a mixture of all colors