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# Describe an experiment to verify the laws of reflection of light.

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#### Laws of reflection. (i) The incident ray, the reflected ray and the normal at the point of incidence, lie in the same plane. (ii) The angle of Incidence and angle of reflection are equal I.e. $$\angle i = \angle r$$. Verification Take a wooden drawing board and fix a white sheet of paper on it. In the middle of paper draw a straight line KK\ Mark a point B on it. Draw a perpendicular BN. Place a mirror XX' on line KK' such that the polished side of the mirror is along the line. Hold the mirror in the mirror holder.Fix two steel pins P and Q on the straight line AB at least 10 cm apart. Look for the images of the pins P and Q and fix two pins P a such that P', Q', and images of P and Q are all in the same straight line. Remove the pins and draw small circles around the pinpricks. Remove the mirror also. Join P'Q' and produce the straight line to meet at B. Measure $$\angle ABN$$ = i and $$\angle CBN$$ = r. It is found that $$\angle i = \angle r$$. This proves that the Angle of Incidence is equal to the Angle of Reflection. As the incident ray, the reflected ray and the normal lie in the plane of the paper, therefore, they lie in the same plane.

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