Thin Film Interference 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!
- 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
Questions: 12 | Attempts: 21048 | Last updated: Mar 22, 2022
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