What is the minimum thickness of coating which should be placed on a lens in ord

Question

What is the minimum thickness of coating which should be placed on a lens in order to minimize reflection of 676 nm light? The index of refraction of the coating material is 1.43 and the index of the glass is 1.68.

hint: You must take into account the 180 degree phase-jump on reflection of light from a medium with a lower index of refraction to a medium of higher index of refraction. Also remember that the wavelength of light changes in a medium. The antireflective coating should be half of the minimum length you determine is necessary for destructive interference to occur.

Explanation / Answer

Dsin(theta)=m*lambda
http://hyperphysics.phy-astr.gsu.edu/hbase/phyopt/antiref.html#c3

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