When
a
____________________
of
light
falls
____________________
at
the
interface
of
two
media
and
continues
to
____________________
in
the
second
medium
,
____________________
new
____________________
approaches
____________________
distances
from
the
____________________
.
As
we
____________________
in
____________________
the
wave
motion
,
this
____________________
is
known
as
refraction
of
a
wave
.
When
a
ray
____________________
light
falls
obliquely
at
____________________
interface
of
two
media
and
continues
to
____________________
in
the
second
medium
,
____________________
new
direction
____________________
or
distances
from
the
normal
.
As
we
____________________
in
analyzing
the
wave
motion
,
this
phenomenon
is
known
as
refraction
of
a
____________________
.
The
geometric
____________________
of
direction
manifests
itself
____________________
as
a
variation
of
the
____________________
of
light
____________________
changing
means
of
propagation
,
keeping
the
____________________
and
____________________
the
wavelength
.
This
____________________
is
due
to
a
property
of
matter
that
we
____________________
with
the
____________________
index
of
a
material
,
____________________
"
n
"
.
