A lens that has an index of refraction of 1.61 is coated witha non-reflective co

Question

A lens that has an index of refraction of 1.61 is coated witha non-reflective coating that has an index of refraction of 1.45.Determine the minimum thickness for the film if it is to benon-reflecting for light of wavelength 5.60 × 102nm.

b. 9.66 ×10–8 m
c. 4.83 ×10–8 m
d. 1.93 ×10–7 m
e. 8.69 × 10–8 m A lens that has an index of refraction of 1.61 is coated witha non-reflective coating that has an index of refraction of 1.45.Determine the minimum thickness for the film if it is to benon-reflecting for light of wavelength 5.60 × 102nm. 9.66 ×10–8 m 4.83 ×10–8 m 1.93 ×10–7 m 8.69 × 10–8 m

Explanation / Answer

for non reflecting surfaces thickness t = /4n                                                          = ( 560 * 10 ^ -9 m ) / ( 4 * 1.45 )                                                           =96.55 * 10 ^ -9 m                                                           ~ 9.66 * 10 ^ -8 m

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