A circular planar wire loop is dipped in a soap solution and after taking it out, held with its plane vertical in air. Assuming thickness of film at the top very small, as sunlight falls on the soap film, & observer receive reflected light.

Options

A. the top portion appears dark while the first colour to be observed as one moves down is red.
B. the top portion appears violet while the first colour to be observed as one moves down is indigo.
C. the top portion appears dark while the first colour to be observed as one move down is violet.
D. the top portion appears dark while the first colour to be observed as one move down depends on the refractive index of the soap solution.

Answer

C