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| Reflection of Plain mirror |
Aim : To verify
the laws of reflection using a plane mirror.
Principle : When a ray of light is incident on a
reflecting surface, it changes its direction of motion and travels in the
original medium following certain laws. This phenomenon is called reflection of light.
Apparatus : Drawing board, a drawing paper (White), a
plane mirror, a foot-rule, a pencil, four pins, four push pins, a protactor, a
stand for the plane mirror.
Apparatus : Drawing board, a drawing paper (White), a
plane mirror, a
foot-rule, a pencil, four pins, four push pins, a protactor, a stand for the
plane mirror.
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| Reflection of Plain mirror Practical |
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| Reflection of Plain mirror |
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| Reflection of Plain mirror |
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| Reflection of Plain mirror |
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| Reflection of Plain mirror |
Ø First
of all fix the white drawing paper on the drawing board using push pins.
Ø First
of all fix the white drawing paper on the drawing board using push pins. Place
the plane mirror along with its stand and fix its position AB.
Ø Now
draw a line PQ which passes through the mid-point ‘P’ of AB and perpendicular
to AB.
Ø Now
draw a line PQ which passes through the mid-point ‘P’ of AB and perpendicular
to AB.
Ø PQ
is called the normal to AB.
Ø Draw
a ray RP which makes some angle with the normal (PQ).
Ø Draw
a ray RP which makes some angle with the normal (PQ). On the ray RP fix two
pins P1 and P2 vertically with 2-3 cm separation between
them. Ray RP is incident ray.
Ø Now
from the other side of PQ , (in which incident ray is not there) see the images
of pins P1 and P2 fix other two pins P3 and P4
vertically so that pins P3, P4 and images P1
and P2 appears collinear at their lower ends.
Ø Now
remove the pins and the mirror. Join the marks of P3 andP4
and obtain the reflected ray PS.
Ø Repeat the experiment for different angles of
incidence. Measure angle of incidence and angle of reflection. Note your
reading in the observations table.
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| Reflection of Plain mirror |
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| Reflection of Plain mirror Observation table |
Conclusion :
Practical uses : We can study the
laws of reflection. We can also study the images obtained by the plane mirror.
We can come to know how reflection is used in various optical appliances, e.g.,
periscope, keleidoscope.
For more details view Video.
For more details view Video.
Reflection of Plain mirror.
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