Phase change on reflection at different media interfaces

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uzman1243
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Homework Statement


Hi,
This is not a homework question. I have my exam for my physics unit tomorrow. I am pretty set for it except for questions of this type. Can you please show me how I can get the answer?

Thanks

[/B]
Diagram of a thin oil film on water at normal incidence: air (n = 1.00) above, oil film (n = 1.50) of thickness t, water (n = 1.33) below, with reflected rays R1 and R2 labelled, plus the printed question and answer ΔΦ = π rad.


Homework Equations


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The Attempt at a Solution


N/A
 
Attachments
  • Diagram of a 360-nm oil film on water at normal incidence: air n = 1.00 above, oil n = 1.50 in the middle, water n = 1.33 below, with incident ray R_Initial and reflected rays R_1 and R_2 labelled.
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Discussion

uzman1243 said:

Homework Statement


Hi,
This is not a homework question. I have my exam for my physics unit tomorrow. I am pretty set for it except for questions of this type. Can you please show me how I can get the answer?

Thanks

[/B]
Diagram of a thin oil film floating on water under normal incidence, with air above. Labels: n air = 1.00, n oil = 1.50, n Water = 1.33, thickness t, and rays R_Initial, R_1 and R_2 reflecting from the top and bottom of the film.


Homework Equations


N/A

The Attempt at a Solution


N/A

Even if it is a study question for an exam, the PF Homework Help rules still apply. You must show the Relevant Equations (yes there are some), and shnow your Attemp at a Solution. This is pretty straightforward if you show some effort on it, IMO.
 
berkeman said:
Even if it is a study question for an exam, the PF Homework Help rules still apply. You must show the Relevant Equations (yes there are some), and shnow your Attemp at a Solution. This is pretty straightforward if you show some effort on it, IMO.
That;s the problem. I don't know what equations to use here.
 

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