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SAT® Subject Test in Physics

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Moderate

Thin Film Interference

SATPHY-CY0FXG

Thin films like soap bubbles and oil floating on water can create colorful patterns.

Which of the following explanations most accurately describes why this happens?

A

Thin films contain many different colored chemicals.

B

Thin films diffract and refract light so that it sets up interference patterns.

C

Thin films provide reflection from the front and back surfaces, and this creates interference patterns.

D

Thin films polarize light which interferes with the unpolarized light to create colors.

E

Thin films absorb some colors and allow others to reflect.