Monochromatic Light $\lambda$ = 500 Nm)is Incident on a Soap Bubble (N =

Multiple Choice

Monochromatic light ( $\lambda$ = 500 nm) is incident on a soap bubble (n = 1.4) that is 50 mm thick.What is the change of phase of the light reflected from the front surface?

A) 0
B) 180 $\degree$
C) $\lambda$ /2
D) $\pi$ /2
E) 55 $\degree$