The angle of incidence is always equal to
the angle of reflection. To get the angle of
incidence draw a normal (perpendicular) line to
the surface of the mirror. The angle between
the ray coming from the object and this normal
line will be the angle of incidence. If it is
a perfect mirror, this will be the angle of
reflection as well.
The question probably refers to a situation
where the object being seen on the mirror is large
such that the different edges of the object have
different reflecting angles; in other words one
cannot see the object as a “point”. This is a case
of generalization; you must view the object as
made up of multiple points. The ray from each of
these points will have different angle of
incidences, and for each point the angle of
incidence will be the angle of reflection.
So, in short, follow the ray from each point
of the object, see where it strikes the mirror,
draw a perpendicular to the mirror’s surface, get
the angle of incidence and you will know the angle
Hope this helps.
Click Here to return to the search form.