Plane Diffraction Grating MCQ

Test your knowledge with important Plane Diffraction Grating MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Plane Diffraction Grating MCQs at Bissoy

• What is shown by the following curve?
  ক

  Resultant Amplitude Curve

  খ

  Resultant Interference Pattern

  গ

  Resultant Intensity Curve

  ঘ

  Resultant Diffraction Pattern
• What is the highest order spectrum which may be seen with a monochromatic light of wavelength 5000 Å by means of a diffraction grating with 5000 lines/cm?
  ক

  1

  খ

  2

  গ

  3

  ঘ

  4
• A beam of monochromatic light is incident on a plane transmission grating having 5000 lines/cm and the second order spectral line is found to be diffracted at 30°. The wavelength of the light is _______
  ক

  4000 Å

  খ

  5000 Å

  গ

  6000 Å

  ঘ

  7000 Å
• What is the relation between the dispersive power, D, of a grating and the order, n, of a spectrum?
  ক

  D ∝ n

  খ

  D ∝ N2

  গ

  D ∝ 1/n

  ঘ

  D ∝ 1/N2
• The expression for the maximum number of orders in a grating spectrum is given by ____________
  ক

  λ/ (a +

  খ

  [ a/λ

  গ

  b/λ

  ঘ

  (a + b)/ λ
• If (a + b) < nλ, then nth order spectrum will be absent.
  ক

  True

  খ

  < nλ, then nth order spectrum will be absent. a) True [ False
• If there are N number of slits in a grating spectra, then there will be how many secondary maximas?
  ক

  N

  খ

  N – 1

  গ

  N – 2

  ঘ

  2N
• Which of the following is the correct expression for the ratio of the intensity of principal maxima to the intensity of secondary maxima?
  ক

  1 + (N2-1) sin2β

  খ

  1/1 + (N2-1) sin2β

  গ

  (N2-1) sin2β

  ঘ

  1/(N2-1) sin2β
• The CDs available in the market act as ____________
  ক

  Diffraction grating

  খ

  Reflection grating

  গ

  Transmission grating

  ঘ

  Do not act as a grating
• If a is the width of the slits and b the distance between the slits, then a + b is called as _________
  ক

  Opacities

  খ

  Transparency

  গ

  Grating Constant

  ঘ

  Grating value