Draw a line MM' on it and mark a point O at the centre of the line and draw a normal ON on MM'.
Draw IO, the incident ray in such a way that IOM is less than 90o.
Place a strip of plane mirror vertically with its silvered surface on MM'.
Fix two pins P and Q on the incident ray IO.
Fix P' and Q' on other side of the normal, to represent the reflected image of P and Q, as observed in the mirror as P' and Q'
Remove the pins and draw a line OR passing through P' and Q' to represent the reflected ray.
Measure the angle of incidence ION and the angle of reflection NOR.
i = r and P, Q, P', Q', N and O lie in the same plane, thus verifying the laws of reflection.
Repeat the experiment for different measures of angle of incidence. The laws of reflection are found to be always true for different values of angle of incidence.
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IOM is less than 90o.
ION and the angle of reflection 
NOR.
r and P, Q, P', Q', N and O lie in the same plane, thus verifying the laws of reflection.
