Two light waves of 587.5 nm are initially out of phase by pi radians and then en
ID: 1293877 • Letter: T
Question
Two light waves of 587.5 nm are initially out of phase by pi radians and then enter blocks of two different media. The indices of refraction of the media are n1=1.40 and n2=1.65.
What is the smallest thickness L that will put the waves exactly in phase once they pass through the two media?
What is the next smallest thickness L that will put the waves exactly in phase once they pass through the two media?
Two light waves of 587.5 nm are initially out of phase by pi radians and then enter blocks of two different media. The indices of refraction of the media are n1=1.40 and n2=1.65. What is the smallest thickness L that will put the waves exactly in phase once they pass through the two media? What is the next smallest thickness L that will put the waves exactly in phase once they pass through the two media?Explanation / Answer
t2 = L/n2
x2 = L
-------------
t1 = L/n1
X1 = L + c*(t2-t1)
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path difference x2 - x1 = c*(t1-t2)
path difference = x2 - x1 = c*L*(1/n1 - 1/n2) = c*L*0.108
phase difference = (2*pi*/?)*path difference
n*pi = (2*pi/?)*c*L*0.108
L = n*?/(2*0.108)
L = n*587.5e-9/0.216
L = n*2.719 *10^-6 m<-------------answer
for n = 1
L = 2.719*10^-6 m < ------answer
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