Wednesday, June 5, 2024

. TO VERIFY THE LAWS OF REFLECTION USING A PLANE MIRROR GSEB Std 8 to 12 Science practical

Reflection of Plain mirror 
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.
Reflection of Plain mirror Practical
Reflection of Plain mirror
Reflection of Plain mirror
Reflection of Plain mirror
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.

Reflection of Plain mirror
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.
Reflection of Plain mirror.

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