Phase Change at reflection:

In summary, the question is asking about the phase change for a system of three substances with different refractive indices, where there is surface reflection between n1 and nf, and between nf and n3. The textbook states that when n1 = n3, there will be a pi phase change, and when n1 > nf > n3 or n1 < nf < n3, there will be no phase change. It can be assumed that in this scenario, there will be a pi phase change.
  • #1
Monochr
3
0

Homework Statement



Part of a longer question, what is the phase change, if any for a system of three substances of different n where there is surface reflection between n1 and n_f which is meant to constructively interfere with another surface reflection between n_f and n3.where n1 < n_f > n3 with n3 > n1?

Homework Equations



None, the textbook I am using only says that when n1 = n3 there will be a pi phase change and there will be none if n1>n_f>n3 or n1<n_f<n3.

The Attempt at a Solution



None, other than an intelligent guess it will be some sort of function with 0 < f(n_f) < pi.
 
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  • #2
Anyone? This is part of a much larger project and I can well assume that it is indeed pi, the point is that I don't want to make too many undue assumptions.
 
  • #3
When a light reflects on a material with higher refractive index it undergoes a phase change of pi in the other case the phase does not change, in your case there will be a pi change on n1, nf and no change at nf ,n3 so the phase change must be pi otherwise the interference would be destructive.
 

What is the definition of phase change at reflection?

Phase change at reflection refers to the change in the state of matter from solid to liquid or liquid to gas when light or other electromagnetic radiation is reflected off the surface of the material.

How does phase change at reflection occur?

Phase change at reflection occurs when the energy from the reflected light causes the molecules in the material to vibrate and gain enough energy to break their bonds and change their state of matter.

What are some examples of phase change at reflection?

Examples of phase change at reflection include melting of ice when sunlight is reflected off of it, evaporation of water when sunlight is reflected off of a lake, and sublimation of dry ice when light is reflected off of it.

How does phase change at reflection affect the appearance of a material?

Phase change at reflection can affect the appearance of a material by changing its physical properties, such as color, texture, and transparency. For example, when ice melts, it becomes clear and transparent instead of white and opaque.

How is phase change at reflection used in scientific research?

Phase change at reflection is used in scientific research to study the properties of different materials, such as their melting point and energy absorption. It is also used in various applications, such as solar panels, where the conversion of light energy to heat can cause a phase change and generate electricity.

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