Quick help with math in thin film problem

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SUMMARY

The discussion focuses on solving the equation (1 / 2) (λ1 / nfilm) (m1) = (1 / 4) (λ2 / nfilm) (2m2 + 1) for the variables m1 and m2, given λ1 = 640 nm and λ2 = 512 nm. The relationship derived is (2*m2 + 1) / (2*m1) = 1.25, leading to the conclusion that m2 can be expressed as m2 = 1.25m1 - 0.5. The values m1 = m2 = 2 satisfy the equation, demonstrating a valid solution. This mathematical approach clarifies the relationship between m1 and m2 in thin film interference problems.

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Homework Statement


(1 / 2) (λ1 /nfilm) (m1) = (1 /4) (λ2 / nfilm) (2m2 +1)

(2*m2 + 1) / (2*m1) =λ1 / λ2 = 640 nm / 512 nm = 1.25

We want to solve for m1 and m2.
I have realized that using m1=m2=2 works but I can't figure out how to reach this conclusion mathematically.

Please, any help will be greatly appreciated.


Homework Equations





The Attempt at a Solution

 
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Hi Anuj68! Welcome to PF! :smile:

(try using the X2 icon just above the Reply box :wink:)
Anuj68 said:
(2*m2 + 1) / (2*m1) =λ1 / λ2 = 640 nm / 512 nm = 1.25

We want to solve for m1 and m2.
I have realized that using m1=m2=2 works but I can't figure out how to reach this conclusion mathematically.

(2m2 + 1)/(2m1) = 1.25

ie (m2 + 0.5)/(m1) = 1.25.

so m2 = 1.25m1 - 0.5 :wink:
 

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