A transparent substrate of index is successively coated with two thin layers: first a…

PHYSICS · Subjective · AP · Physics 2: Algebra-based · Waves Sound and Physical Optics · Waves Sound and Physical Optics

Problem

A transparent substrate of index

1.60

is successively coated with two thin layers: first a layer of index

1.30

and then a layer of index

1.45

. Each layer has an optical thickness of

\lambda/4

for a design wavelength

\lambda

at normal incidence (that is,

n_i t_i = \lambda/4

for each layer). Rank, from highest to lowest, the expected reflected intensity at wavelength

\lambda

for the following surfaces: I. Bare substrate II. Substrate with only the

n = 1.30

layer III. Substrate with both layers as described Provide your ranking in the form highest

> \dots >

lowest and justify it briefly.