Question:
Colors seen when gasoline forms a thin film on water are a demonstration of __________.
A) refraction.
B) reflection.
C) dispersion.
D) polarization.
E) interference
Answer:
Colors seen when gasoline forms a thin film on water are a demonstration of interference.
Step-by-step explanation:
Interference is the phenomenon of the combination of intensities of two unknown coherent sources, and result in a newer intensity. This newer intensity has different color when compared to the other two. Then, the third color is visible on the surface.
As the question says, when the gasoline is applied on water, there exists two different media. When light travels through it, the coherent sources undergo a change in their intensities. Hence, different colors among the VIBGYOR, the components of white light, are observed.