Reflection of Light by Oil on Water

AI Thread Summary
To determine the thickness of an oil layer that most effectively reflects light, one must consider thin film interference principles. The condition for constructive interference requires that the reflected waves from both the oil and water surfaces be in phase. This involves calculating the oil thickness based on the wavelength of light (590nm) and the refractive indices of both substances. Resources like Hyperphysics can provide additional guidance on the topic. Understanding these concepts is essential for solving the problem effectively.
MyNameIsKhan
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Right, so, I am new to this, so please excuse me if I make a glaring error.

Say there is can of water with a layer on oil on the surface. Light (of lambda=590nm) is shone straight down on the oil. How do I find out the thickness of the oil layer that would most strongly reflect the light?
 
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Hi and welcome to Physics Forums
Is this a homework question, by any chance? You are referring to thin film interference, I guess. What is the condition for the waves, reflected from both surfaces, to be in phase when they emerge from the surface? PF doesn't usually just give the answers to question like this one and what I have written should help you to find the right answer. (Or you could look at the Hyperphysics website if you don't have a textbook)
 
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