Wave Optics Ques 15
15. Colours appear on a thin soap film and on soap bubbles due to the phenomenon of
[1999]
(a) refraction
(b) dispersion
(c) interference
(d) diffraction
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Answer:
Correct Answer: 15.(c)
Solution:
- (c) We know that the colours for which the condition of constructive interference is satisfied are observed in a given region of the film. The path difference between the light waves reaching the eye changes when the position of the eye is changed. Therefore, colours appear on a thin soap film or soap bubbles due to the phenomenon of interference.
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