Reflection dependence from wavelenght

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Homework Help Overview

The discussion revolves around a physics problem involving the reflection of light from a thin glass plate, specifically focusing on how different wavelengths of light may experience varying intensities upon reflection. The original poster expresses confusion regarding the relationship between wavelength and intensity in the context of reflection and interference phenomena.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants discuss the relevance of interference in determining which wavelengths experience constructive interference in reflected light. There is an exploration of the Thin Film interference equation and its application to the problem. Some participants question the necessity of calculating the angle of incidence given that it is perpendicular.

Discussion Status

Participants are actively engaging with the problem, offering guidance on the use of Snell's law and the Thin Film interference equation. There is a recognition of the conditions for constructive interference, and some clarification on the angle of incidence has been provided. However, no consensus has been reached regarding the complete solution.

Contextual Notes

The problem is constrained by the specifics of the glass plate's thickness and the nature of the incident light. The original poster seeks guidance on the physical phenomena relevant to the problem without having a complete understanding of the underlying principles.

prehisto
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Homework Statement


Hi guys, I have this exercise and I m confused.
Incident (white light) light ray is perpendicular to glass surface , glass plate is 0,4microm thick. Which wavelengths in reflected ray becomes more intense?

Homework Equations

The Attempt at a Solution


So i know that light is refracted on the surface of 2 different mediums, different wavelengths are refracted in different angles.
But i do not know nothing about wavelength and/or intensity dependence from reflection. And its seems weird that intensity of some wavelengths increases after reflection.

Could someone,please, help?
Maybe some tips about which physical phenomenon I should study?
 
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prehisto said:

Homework Statement


Hi guys, I have this exercise and I m confused.
Incident (white light) light ray is perpendicular to glass surface , glass plate is 0,4microm thick. Which wavelengths in reflected ray becomes more intense?

Homework Equations

The Attempt at a Solution


So i know that light is refracted on the surface of 2 different mediums, different wavelengths are refracted in different angles.
But i do not know nothing about wavelength and/or intensity dependence from reflection. And its seems weird that intensity of some wavelengths increases after reflection.

Could someone,please, help?
Maybe some tips about which physical phenomenon I should study?
Think of interference. For which wavelength is constructive interference in the reflected light?
 
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ehild said:
Think of interference. For which wavelength is constructive interference in the reflected light?

Thank you for your reply
Ok, I think I go it.
First I calculate the angle of light ray inside the glass from Snell's law.
Second I use Thin films equation for constructive interference and calculate the wavelengths by altering m in the formula.
Correct?
 
prehisto said:
Thank you for your reply
Ok, I think I go it.
First I calculate the angle of light ray inside the glass from Snell's law.
Second I use Thin films equation for constructive interference and calculate the wavelengths by altering m in the formula.
Correct?
No need to calculate the angle, as the incidence is perpendicular, that is, the angle of incidence is 0 degree. The refracted ray does not change direction.
The second plan is correct, find the condition for constructive interference for reflected light and select the wavelength by altering m.
 
ehild said:
No need to calculate the angle, as the incidence is perpendicular, that is, the angle of incidence is 0 degree. The refracted ray does not change direction.
The second plan is correct, find the condition for constructive interference for reflected light and select the wavelength by altering m.

OK, thank you again for help!
 

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