Optics : White light incident on water drop

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Homework Help Overview

The discussion revolves around the behavior of white light as it interacts with a spherical water drop, particularly focusing on the concepts of deviation and dispersion of light. Participants are exploring how these phenomena differ from those observed with a triangular prism.

Discussion Character

  • Conceptual clarification, Assumption checking, Exploratory

Approaches and Questions Raised

  • Participants are questioning the laws governing light deviation, with references to Snell's law and discussions about the implications of the angle of incidence. Some are uncertain about the effects of the spherical shape on light behavior, while others are exploring the conditions under which dispersion occurs.

Discussion Status

The discussion is active, with various interpretations being explored regarding the behavior of light in a spherical drop. Some participants have offered insights into the role of angles and the nature of light rays, while others are questioning the necessity of specific laws for determining deviation.

Contextual Notes

There are indications of confusion regarding the conditions of the problem, such as the shape of the drop and the angle of incidence, which may affect the understanding of light behavior. Participants are also addressing the potential for partial reflections and the implications of light interacting with the drop's surfaces.

Jahnavi
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1. Homework Statement

Homework Equations

The Attempt at a Solution


[/B]
I know that if white light is incident on a triangular prism , then lights of different wavelengths are deviated by different amounts and dispersion occurs .

But I am not sure what would happen in this case where we have a spherical drop .

Please help me understand this conceptual question.
 

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What law determines the deviation?
 
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haruspex said:
What law determines the deviation?

Snell's law .

OK . I got your point . But what if the incident ray is at some angle to horizontal ?
 
Last edited:
Jahnavi said:
View attachment 206690 1. Homework Statement

Homework Equations

The Attempt at a Solution


[/B]
I know that if white light is incident on a triangular prism , then lights of different wavelengths are deviated by different amounts and dispersion occurs .

But I am not sure what would happen in this case where we have a spherical drop .

Please help me understand this conceptual question.
A is correct answer. if it the spherical considered as regular.if it is not the answer be B.
 
haruspex said:
What law determines the deviation?
nothing law is necessary for determining the deviation.
 
sanujan said:
A is correct answer. if it the spherical considered as regular.if it is not the answer be B.

What is your reasoning ?
 
Jahnavi said:
What is your reasoning ?
draw perpendicular line for the circle it will goes through the radius of the circle and the normal also in the line of radius.and the light incident on spherical through radius.
i think u know that any of light ray do not deflect when incident through normal line
 
sanujan said:
if it is not the answer be B.

What do you mean by above ?
 
@haruspex , what would happen if ray is incident at some angle ?
 
  • #10
If the rain drop is regularly spherical then there is no colour dispersion occur.
 
  • #11
Jahnavi said:
Snell's law .

OK . I got your point . But what if the incident ray is at some angle to horizontal ?
Do you mean, at some angle to the normal? Then there would be deviation, dispersion, and maybe internal reflection.
 
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  • #12
Reflect on the first surface
Emerges from the other surface
Note that a partial reflection also takes place on the surfaces
 
  • #13
sanujan said:
Reflect on the first surface
Emerges from the other surface
Note that a partial reflection also takes place on the surfaces
Yes, but I don't think that is what B is referring to.
 
  • #14
sanujan said:
nothing law is necessary for determining the deviation.
Snell's law gives the answer. It might or might not be necessary to appeal to that.
 
  • #15
In a water drop there is no full molecules or full of space
 

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