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(b) If you are below the surface of a still pond on which a 0.001 mm...

(b) If you are below the surface of a still pond on which a 0.001 mm thickness of oil (n = 1.25) is floating, what, if any, colors will be enhanced in the sunlight from directly overhead?

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Answer #1

We know that For Oil, n = 1.25

For water, n = 1.3,

Since Oil is floating with thickness of 0.001 mm over water,

As per Law of Refraction, When sunlight passes through Oil over the surface of water, Both Refraction and Reflection will happen within the oil film and because of sunlight, Colors get seperated and gives Colors of Rainbow ( VIBGYOR ).

In addition to that depends upon the distance travelled by light rays, two types of interference will happen,

1. Constructive Interference ( if light rays reinforce each other from multiple spots)

2. Destructive Interference ( if light rays cancel each other).

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