Reflection - Light Video Lecture - Science Class 8

reflection of light when array of light
while traveling from one optical medium
to another optical medium say from air
to glass strikes the surface of
separation of two media is returned by
the second optical medium into the first
optical medium with a change of angle
the phenomenon is called the reflection
of light any smooth polished surface can
turn the rays of light back into the
same medium is called a mirror a looking
glass is the best example of a mirror
note that besides mirror other smooth
polished surfaces also reflect light
polished floors and table stalks reflect
light you must have seen the reflection
of the moon or trees on the clear still
water
let us perform an activity to see how
light gets reflected from a plane mirror
take a torch cover its glass with a
chart paper which has three slits as
shown
take a smooth wooden plank and spread a
wide chart paper on it fix a plane
mirror over the chart paper
now direct the beam of light from the
torch on the mirror adjust the position
of Dodge
so that the light strikes the mirror at
an angle what do you observe the mirror
changes the direction of light that
falls on it the entire phenomenon is
explained like this that a beam of light
strikes a plane mirror forming an angle
I with the normal of the mirror the beam
is reflected back making an angle of the
same magnitude with the normal of the
mirror