Physics

Problem

A thin layer of oil (

n=1.45

) floats on water (

n=1.33

). Monochromatic light in air is incident normally on the oil. Which combination of phase changes occurs for the two rays that interfere after reflecting from the top and bottom surfaces of the oil layer? a)

0^\circ

for the reflection at the air–oil surface and

180^\circ

for the reflection at the oil–water surface b)

0^\circ

for both reflections c)

180^\circ

for the reflection at the air–oil surface and

0^\circ

for the reflection at the oil–water surface d)

180^\circ

for both reflections

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