Reflected white light, thin transparent coating on glass

In summary, when using reflected white light to observe a thin transparent coating on glass as the coating material is gradually deposited by evaporation in a vacuum, interference of waves reflected from the opposite surface of the film would cause a band of colors to be formed in the film. The geometry of the reflection, whether it is a collimated beam or a point source, and how the reflection is observed, will affect the color changes that occur. Further research on anti-reflective coatings, Fresnel equations, and the derivation of the Fresnel laws in an electromagnetic course could provide more information. The full theory of the thin film may also be available through additional research.
  • #1
aquabum619
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Homework Statement



Suppose a reflected white light is used to observe a thin transparent coating on glass as the coating material is gradually deposited by evaporation in a vacuum, Describe color changes that might occur during the process of building up the thickness of the coating


Homework Equations





The Attempt at a Solution


im not sure
 
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  • #2
The interference of waves reflected from the opposite surface of the film would cause a band of colors to be formed in the film.
Is this correct?
 
  • #3
I think you should describe the geometry with more precision. (my feeling)
Do you mean a collimated beam shining with some angle on the thin film?
Or maybe it is a point source of white light illuminating the whole film?
How is the reflexion observed?
I think these links could be useful:
http://en.wikipedia.org/wiki/Anti-reflective_coating
http://en.wikipedia.org/wiki/Fresnel_equations
The derivation of the Fresnel laws in an EM course could be instructive.
Finally, you should ask yourself the question: why would different colors behave differently in the reflexion? What is the reason?
I could not find the full theory of the thin film on the web, you should try.
 

1. What is reflected white light?

Reflected white light is a type of light that is made up of all the colors of the visible spectrum (red, orange, yellow, green, blue, indigo, and violet) and appears white to the human eye. It is created when light waves bounce off of an object and reflect into our eyes.

2. How does a thin transparent coating on glass affect reflected white light?

A thin transparent coating on glass can affect reflected white light in a few ways. It can change the color of the light by selectively reflecting or absorbing certain wavelengths, giving the appearance of a tint or color. It can also increase or decrease the amount of light that is reflected, depending on the thickness and properties of the coating.

3. What is the purpose of applying a thin transparent coating on glass?

The purpose of applying a thin transparent coating on glass is often to improve the visual or functional properties of the glass. For example, a coating may be applied to reduce glare or increase energy efficiency. It can also be used for decorative purposes, such as creating a colored or mirrored effect.

4. Can a thin transparent coating on glass affect the transparency of the glass?

Yes, a thin transparent coating on glass can affect the transparency of the glass. Depending on the type and thickness of the coating, it may reduce the amount of light that can pass through the glass, making it less transparent. However, some coatings are designed to be optically clear and have minimal impact on the transparency of the glass.

5. How is reflected white light used in practical applications?

Reflected white light is used in a variety of practical applications, such as in mirrors, windows, and optical devices. It can also be used in lighting, photography, and color mixing. In addition, the properties of reflected white light can be manipulated through coatings and filters to achieve specific visual or functional effects, making it a valuable tool in many industries.

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