Question

Soap bubble appears coloured due to the phenomenon of:-

• A. Total internal feflection
• B. Interference by division of amplitude
• C. Interference by division of wavefront
• D. Diffraction of light

Answer 1

The correct option is C Interference by division of wavefront

It is due to the interference of light. As the position of eyes is changed, path difference corresponding to different wavelength of the light emitted by the bubble change. Thus the intensities of different wavelengths are different resulting the bubble to be appeared colored.

Option $-C$ is correct.