Page 133 - Innovator's Science-8

Observa on: In the case of mirror and steel plate, we will see a patch of light on the
wall. Patch of light cannot be seen in the case of paper. This proves that light is
reflected be er by smooth and shiny surfaces.

Activity-5 Aim: To study the reflec on of light through a plane mirror
When light falls on a plane mirror, it gets reflected. The ray of light that falls on the
Experiential Learning
surface of the plane mirror is known as incident ray and the ray that is refelected by
the surface of the mirror is known as reflected ray. The point where the incident ray
strikes on the mirror is called the point of
incidence. A perpendicular line to the mirror
drawn from the point of incidence is called
normal. The angel between the incident ray
and the normal ray is known as angel of
incidence. The angel between the normal and
the reflected ray is known as angel of
Science reflec on. The angel of incidence is always Ray diagram of reflec on
Bytes
through plane mirror
equal to the angel of reflec on.
Testimony
When you raise your right An image of an object is formed on a surface if it reflect most to the light that falls on
hand in front of a mirror, it from the object For example, if you stand in front of a mirror, your image can be
it appears as if your le seen in the mirror.
hand is raised? This
happens because a plane
mirror reverses the image Types of Images
sideways a phenomenon
called lateral inversion. There are two types of images real— image and virtual image .
It's why ambulance signs A real image can be taken on a screen. An
are wri en in reverse so
drivers can read them example of a real image is the image formed
correctly in their rear- on a screen by a projector in a theatre.
view mirrors!
A virtual image cannot be taken on a screen.
An example of a virtual image is the image
formed by a plane mirror.

Any smooth or polished surface that reflects
light to form an image is known as a mirror .
When the reflecting surface of the mirror is

plane, then the mirror is called a plane mirror . The image formed by the
plane mirror has the following features:
• It is virtual and erect (upright).

• The size of the image is same as that of the object.

• The image formed is at the same distance as the object from the mirror.
• The image is laterally inverted.

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