Optics Interference Quizzes, Questions & Answers

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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...

Questions: 10 | Attempts: 3704 | Last updated: Jun 22, 2025

Sample Question 1
Different colours are visible when looking perpendicularly on a thin film of soap because

The film reflects some of the light

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

The reflected ray changes phase by λ/2

All of the above

None of the Above

Sample Question 2
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

The reflected light becomes brighter and brighter

The reflected light alternates between dark and bright spots

The reflected light becomes darker and darker

There is no reflected light

None of the Above

Sample Question 3
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?

6.0 X 10^-7 m

1.8 X 10^-6 m

1.1 X 10^-7 m

4.8 X 10^-6 m

None of the Above