L8 : Lateral Inversion - Light, Science, Class 7 Video Lecture

hello friends this video on light part 8
is brought to you by exam feel calm no
more fear from exam so this concept is
what we call as lateral inversion
inversion means something which get
reversed so it is the phenomenon where
left appears right and right appears
left in in case with a plane mirror so
whenever you stand in front of the
mirror in this case you see the boy has
is pointing with his left hand but on
the middle it will appear as if he is
doing it with his right hand so how does
this happen so do you think you get this
type of image you don't you don't get
this type of image so this doesn't
happen so that is why the reversal of
mirrors image left and right as compared
to the object viewed by us this is known
as a lateral inversion and this type of
image formation never happens so let's
look at this example which will help you
to understand it more easy so if you
have a board on which is written light
and if you place it in front of a plane
mirror the image that is formed would
leave something like this which is again
very much interesting so you see it it
reads it in the reverse way so this also
proves the concept of lack of an
inversion that yes there's something
like reversal happens with plane mirror
now you might ask that how does this
happen how this diversa happens now it
happens on a very simple concept and you
know what is that concept so that
concept is nothing but what we learnt in
the previous slide that image distance
is always equal to object distance in
case of a plane mirror that means the
distance of the object from the mirror
will be equal to the distance of the
image from the mirror so when you have
light written so when the image
formation happens so for T this is the
distance of T from the mirror so the
image for T will also happen at the same
distance from the mirror so n n is
at this much distance from the mirror so
the image for L will also be formed at
this much distance from the mirror so
based on this concept the reversal of
images take place because each partner
not even L each part of the L so if you
look at this part of the air the image
for this part is formed here because the
distance of this part from the mirror is
equal to the distance of this part from
the mirror so each point of the object
for this image is being formed it
follows this property that the distance
of that point from the middle is same as
the distance of that corresponding point
for the object is from the bill so based
on this concept isn't I lateral
inversion takes place so you think of
another example so let's say if you have
a board on which light is written and
now you have a mirror placed here right
so you see in this case the image looks
different than it was in this case
because the placement of the mirror has
changed now since the mirror is placed
here so now the distances will be
measured from this direction so that's
how the image which is formed in this
case is different from the image which
is one in this case so it depends where
exactly the clay material is located to
decide how the image would be so let us
try to do it ourselves so we will do it
with the same thing let's say this is
light okay and this is the middle so the
how the image will be formed so let's
consider this point so the distance of
this point is this much so almost at the
same distance we draw a point that is
this point the image for this point
would be this point now let's consider
this point which is at this much
distance so basically at the same
distance we will draw another point
right again let's consider this point
which is at this much distance and again
at the same distance we will point we
will give another point so you see this
is how the image will perform so L is
formed like this similarly I GH
and so on would be formed so basically
this concept this simple concept that
the distance of the image would be the
same as the distance of the object head
results in lateral inversion so if even
if you look at this image from nature
when we saw that the surface of water
access the mirror so here also you see
the smaller clouds which are present at
the bottom in their mirror images they
are present at the top that is also
because of lateral inversion so whatever
was present up now appears to be present
down whatever was present down now
appears to be present up so that's
nothing but lateral inversion thank you
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