CBSE  /  Class 12  /  Physics  /  Wave Optics

  • 1. 
    In vacuum, the speed of light depends upon :

  • frequency
  • velocity
  • wave length
  • None of these

  • 2. 
    The fringe width (β) of a diffraction pattern and the slit width d are related as:

  • β ∝ d
  • β ∝\(\frac{1}{d}\)
  • β ∝ √d
  • β ∝ \(\frac{1}{d^2}\)

  • 3. 
    C.V. Raman was awarded the Nobel prize for his work associated with which of the following phenomenon of radiations?

  • scattering
  • diffraction
  • interference
  • polarisation

  • 4. 
    Light takes 10-10 to cross a glass slab. What is the thickness of the glass slab?

  • 2 cm
  • 3 cm
  • 2.5 cm
  • 3.5 cm

  • 5. 
    In Young's double slit experiment, the central point on the screen is:

  • bright
  • dark
  • first bright and later dark
  • first dark and later bright

  • 6. 
    Between the slit is id\ the distance between the slit and the screen is α, with light of wavelength λ, the number of fringe observed per metre on the screen is:

  • \(\frac{δy}{α}\)
  • \(\frac{Dα}{λ}\)
  • \(\frac{α}{Dλ}\)
  • \(\frac{λd}{D}\)

  • 7. 
    In Young's double slit experiment the distance between the slit and the screen is doubled and the separation between the slit is reduced to half. The fringe width:

  • is doubled
  • become four time
  • is halfed
  • remain unchanged

  • 8. 
    In a Young's double slit experiment the distance between the slit is 1 mm and the distance of screen from the slit is 1 m. If light of wavelength 6000 A is used then the fringe width is:

  • 0.4 mm
  • 0.5 mm
  • 0.6 mm
  • 0.8 mm

  • 9. 
    A person cannot see object clearly beyond 50 cm. The pow er of the lens to correct his vision is :

  • +0.5 dioptre
  • -0.5 dioptre
  • -2 dioptre
  • +2 dioptre

  • 10. 
    A phase difference of 5π corresponds to a path difference (in terms of λ) of:

  • 5λ
  • 10λ.
  • 5λ/2
  • 2λ
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