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Byju's Answer
Standard X
Physics
Refraction through Glass Slab
why does an e...
Question
why does an excessively thin film appear black in reflected light?
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Solution
Excessively
thin
film
is
black
in
reflected
system
.
the
effective
path
diffrence
between
the
interfering
reflected
rays
is
2
μcosr
-
λ
2
.
when
the
film
is
excessivly
thin
,
so
that
the
t
is
practically
zero
,
the
effective
path
diffrence
is
λ
2
.
this
is
the
condition
for
minimum
intensity
.
hence
the
film
appears
dark
.
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