Thin Film Interference Quiz

10 Questions | Total Attempts: 3228

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Thin Film Interference Quiz - Quiz

Check out our short quiz on the key concepts in the Thin-film interference unit. Play the quiz if you wish to check how strong your basics are regarding this phenomenon. Thin-film interference is a natural phenomenon that occurs when light waves are reflected from different surfaces of a thin film. Here, you will have to solve a few numerical based on the same concept. Do you think you can do so? Take the test and see for yourself. Good luck!


Questions and Answers
  • 1. 
    If you look perpendicularly at the thin glass film and move your head away from the glass film (staying perpendicular to the film), you will notice
    • A. 

      The reflected light becomes brighter and brighter

    • B. 

      The reflected light alternates between dark and bright spots

    • C. 

      The reflected light becomes darker and darker

    • D. 

      There is no reflected light

    • E. 

      None of the Above

  • 2. 
    A lens (n=1.52) is coated witha film of magnesium fluoride (n=1.25). What should be the least thickness of the film in order to minimize reflected light with a wavelength of 550 nm?
    • A. 

      6.0 X 10^-7 m

    • B. 

      1.8 X 10^-6 m

    • C. 

      1.1 X 10^-7 m

    • D. 

      4.8 X 10^-6 m

    • E. 

      None of the Above

  • 3. 
    When light travels from a fast medium to a slower medium, the refracted ray
    • A. 

      Changes phase by λ/2

    • B. 

      Changes phase by λ/3

    • C. 

      Changes phase by 3λ/2

    • D. 

      Changes phase by λ/4

    • E. 

      None of the Above

  • 4. 
    When a thin glass pane is viewed perpendicularly in white light, only bright white and dark spots are visible.
    • A. 

      True

    • B. 

      False

  • 5. 
    A soap film with a thickness of 93 nm has a refractive index of 1.35. When viewed perpendicularly in white light, what wavelength of light is strongly reflected?
    • A. 

      600nm

    • B. 

      483nm

    • C. 

      500nm

    • D. 

      650nm

    • E. 

      None of the Above

  • 6. 
    Interference doesn't occur in thick films because the refracted ray slows down too much.
    • A. 

      True

    • B. 

      False

  • 7. 
    The optical path of light in a thickness of glass is larger than the optical path in the same thickness of air.
    • A. 

      True

    • B. 

      False

  • 8. 
    Different colours are visible when looking perpendicularly on a thin film of soap because 
    • A. 

      The film reflects some of the light

    • B. 

      The film is thin enough so that the refracted ray is close to the reflected ray

    • C. 

      The reflected ray changes phase by λ/2

    • D. 

      All of the above

    • E. 

      None of the Above

  • 9. 
    Interference in thin films follows the same mathematical model as Single Slit Diffraction for constructive interference.
    • A. 

      True

    • B. 

      False

  • 10. 
    Thin film interference occurs because the film polarizes the reflected light.
    • A. 

      True

    • B. 

      False

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