A) The disperation of light
B) The interference of the reflected light
C) The scattering of light by thin film
D) The characteristic colour of soap solution
Correct Answer: B
Solution :
[b] The iridescence of a soap bubble, which seems to contain a wealth of changing colour, stems from light striking the bubble from varied angles. The path length varies with the angle of incident light, giving varying path differences for the internally and externally reflected rays at different points on the bubble. This means that, even if the soap film is of uniform thickness, different colours can be seen. Light entering the bubble directly travels a shorter path than light entering at a wider angle. This allows different wavelengths to undergo constructive and destructive interference, so different colours are perceived.
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