Optics : White light incident on water drop

[Jahnavi]

1. Homework Statement

Homework Equations

The Attempt at a Solution

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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.

 

[haruspex]

What law determines the deviation?

 

[Jahnavi]

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 ?

 

[sanujan]

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.

 

[sanujan]

What law determines the deviation?

nothing law is necessary for determining the deviation.

 

[Jahnavi]

A is correct answer. if it the spherical considered as regular.if it is not the answer be B.

What is your reasoning ?

 

[sanujan]

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

 

[Jahnavi]

if it is not the answer be B.

What do you mean by above ?

 

[Jahnavi]

@haruspex , what would happen if ray is incident at some angle ?

 

[sanujan]

If the rain drop is regularly spherical then there is no colour dispersion occur.

 

[haruspex]

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.

 

[sanujan]

Reflect on the first surface
Emerges from the other surface
Note that a partial reflection also takes place on the surfaces

 

[haruspex]

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.

 

[haruspex]

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.

 

[sanujan]

In a water drop there is no full molecules or full of space