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Plane mirror , Plane mirrors are made by depositing a Silver layer on one side of a glass plate and then the Silver layer is protected by a paint., Silver metal is one of the best reflectors of light. But now-a-days instead of Silver, a thin layer of Aluminium is used to deposit on glass plates, because Aluminium is much cheaper than Silver and it also reflects light very well.

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Activity, Check your understanding of reflection, Look at figures a and b. Let us suppose that you have , been given a plane mirror strip., What will you do to obtain figures that are shown in , figure b using mirror strip and figure a?, Place the plane mirror strip on the figure shown in a in such a manner that you see one of the figures shown in figure b. The procedure is shown in figure c

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Reflection of light by plane mirrors, Aim: Verification of laws of reflection, Required material: mirror strip, drawing board, white paper, pins, clamps, scale and pencil, Procedure: , Take a drawing board and fix a white paper on it with the help of clamps., Draw a straight line AB at the centre of the paper and also a normal (ON) to AB at the point ‘O’.

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Fix two more pins R and S such that they are in the same line as that of PI and QI. Join R, S and O as shown in fig., Observation, Measure the angle between RS and ON (angle of reflection)., Repeat the experiment for different angles of incidence and measure the corresponding angles of reflection (r). Record your observations in table.

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Result , angle of incidence = angle of reflection, Plane of reflection, The incident ray is the ray which passes through the points P and Q touching the paper. The reflected ray is the ray which passes through the points R and S touching the same paper, and ON is the normal to the mirror at point O., The two rays and the normal lie in the same plane., The plane in which the incident ray, reflected ray , and normal lie is the plane of reflection., If a ray incidents normally on a plane mirror, , what will be the angle of reflection?, Explain the process of formation of an image , with a pinhole camera? Draw a ray diagram to, show this. , Verify laws of reflection experimentally.