05quiz_08

05quiz_08 - Physics 9B-C 10/31/2008 Quiz #5 Name: Last four...

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Physics 9B-C Quiz #5 Name: 10/31/2008 Last four of ID: A
soap
film
is
illuminated
with
blue
(480
nm)
light.

The
index
of
refraction
of
the
film
is
1.33
 and
has
air
on
both
sides. a)
(5
pts)

Find
an
expression
for
the
phase
difference
between
rays
reflected
from
the
top
(1)
and
 bottom
(2)
surfaces
if
the
thickness
of
the
film
is
 t. For
the
top
reflection
from
the
soap
film,
ƒ 1 =
π,
or
-π
because
the
wave
reflected
from
the
glass
 will
be
inverted. The
transmitted
ray
experiences
a
phase
shift
due
to
the
path
difference,
2
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