Interference and Diffraction MCQ Multiple Choice Questions - Page 3 for Practice

Q: 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?

Correct Answer is: They will disappear

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

Correct Answer is: They will disappear

Q: 33. In Newtons rings the central spot is

Correct Answer is: can be bright or dark

Q: 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

Correct Answer is: 5000 lines/cm

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

Correct Answer is: Thickness of the film should be increased for light of same wavelength but higher intensity

Q: 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?

Correct Answer is: Bandwidth increases

Q: 38. In wedge shaped film the interference pattern has nature

Correct Answer is: Parallel to contact edge

Q: 39. Interference in thin film is mainly because of

Correct Answer is: Division amplitude

Q: 40. Interference in thin film is mainly because of

Correct Answer is: Division amplitude

Q: 41. Interference of light is evidence that

Correct Answer is: Light is a wave phenomenon

Interference and Diffraction MCQ Questions 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?

They will become brighter
They will become darker
They will disappear
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?

They will become more bright
They will become more dark
They will disappear
They will be more dense

33. In Newtons rings the central spot is

Always bright
always dark
can be bright or dark
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

1000 lines/cm
5000 lines/cm
500 lines/cm
10000 lines/cm

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

Thickness of the film should be changed for light of same wavelength but different intensity
Thickness of the film need not be changed for light of same wavelength but different intensity
Thickness of the film should be increased for light of same wavelength but higher intensity
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

dark
Bright
Uniform
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?

Bandwidth increases
Bandwidth decreases
Bands will merge
There will not any effect

38. In wedge shaped film the interference pattern has nature

Parallel to the end where thickness is non-zero
Perpendicular to contact edge
Parallel to contact edge
Perpendicular to the end where thickness is non-zero

39. Interference in thin film is mainly because of

Division amplitude
Division of wave fronts
Addition of amplitude
Addition of wave fronts

40. Interference in thin film is mainly because of

Division amplitude
Division of wave fronts
Addition of amplitude
Addition of wave fronts

41. Interference of light is evidence that

The speed of light is very large
light is a transverse wave
light is electromagnetic in character
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?

Bandwidth increases
Bandwidth decreases
Bands will disappear
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?

Bandwidth increases
Bandwidth decreases
Bands will disappear
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?

Bandwidth increases
Bandwidth decreases
Bands will merge
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?

It will turn to dark
It will turn to bright
Bands will disappear
It will be a mixture of all colors