- #1
nabilsaleh
- 14
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Homework Statement
A 360 nm thick oil film floats on the surface of the water. The indices of refraction of the oil and the water are 1.50 and 1.33, respectively. The surface of the oil is illuminated from above at normal incidence with white light. The two wavelengths of light in the 400 nm to 800 nm wavelength band that are most strongly reflected, in nm, are closest to:
A) 410 and 700
B) 430 and 720
C) 450 and 740
D) 470 and 760
E) 490 and 780
this question came several times on previous exams but i just can't figure out how to solve it and there is no solution online...the answer though is B!
Homework Equations
i'm guessing that i should be using this formula:
2L=((m+1/2)*lamda)/n
lamda is the wavelength
n is the index or refraction