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NCERT Solutions Class 8 Science Solutions for Exercise in Chapter 16 - Light
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(a) Find out the position of the image of an object situated at A in the plane mirror (Fig. 16.21).
(b) Can Paheli at B see this image?
(c) Can Boojho at C see this image?
(d) When Paheli moves from B to C, where does the image of A move?
Answer:
a) Image of an object placed at A is formed behind the mirror. The distance of the image from the mirror is equal to the distance of A from the mirror
b)Yes Paheli at B can see this image.
c) Yes Boojho at C can see this image.
d) Image of the object at A will not move. It will remain at the same position when Paheli moves from B to C.
Video transcript
"hello students my name is rabbit singh
and i welcome you all
to leader learning homework one of
india's best online classes
now today in this video we have a
question that is based on the topic
plane mirror the question says find out
the position of the image of an
object situated at a in the plane mirror
you can see this is
a and this is a plane mirror
so let us label it as plane mirror
now figure 16.21 you can see this is
figure 16.21
now question says first one you have to
find the position of the image of an
object situated at a in the plane mirror
so what will be the position of the
image so you can see
image if an object placed at a is formed
behind the mirror
where it will be formed it will be
formed behind the mirror why it will be
formed behind the mirror
because in a plane mirror sign
convention states
object distance is always equal to the
object distance is always equal to the
image distance so we will apply that
concept
so if this is here this will also be
here so the distance of the image from
the mirror is equal to the distance of
a from the mirror so whatever with this
distance same distance will be there for
a
so object distance is equal to image
distance so first answer is that
now b point can bahili at b
see this image now bahili is at point b
so can bahili at b see this image
so answer will be yes we can see
this image because in a plane mirror
the images are made that are virtual
and erect third can boojo at c see this
image
so this is boojo so answer for this one
also will be
yes bujo ads you can see this image now
when pahili moves from b to c so like
let us change the color if bahili is
moving from b to c
where does the image of a move so image
of
object at a will not move it will remain
at the same position
when bahili moves from b to c because
they are interchanging their position
but a remains as it is so there will be
no change in the position
of a so there will be no change in the
position of
a because a has not moved so answer will
be
a has not moved so it will remain at the
same position when
he moves from b to c like when h3 is
moving from b to c so i hope you have
understood the concept very clearly
but still if you have any doubt do
comment in the comment box and please
like and subscribe our channel for lido
thank you
"
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