Fig 1.0. This show the details
involved with the reflection of a light wave, this also applies
to other waves in the
In this case, the reflective surface is a mirror,
the incident ray (represented by the red
line) is aimed at the mirror, a reflected ray (represented
by the blue line) will then be bounced off the mirror.
Depending on the quality of the reflective surface, and the
material, you can reflect up to 99 % of the original energy
(this is taking into account, the energy lost due to absorption)
The Law of Reflection:
angle of reflection is equal to the angle of incidence from
Light is always reflected at
an equal angle from the normal (represented
by the green perforated line) as the angle from the normal
and the incident ray in any given case.
Reflections In Mirrors:
Fig 1.1. This shows how a virtual
Image (cannot be projected onto a screen) is produce by the
reflection of the object. The reflected image appears 'behind'
Fig 1.2. This shows the principle
of reflection from a convex mirror, again the virtual image
appears behind the mirror.
Fig 1.3. This shows how the use
of a concave mirror is used to focus light to a point. One application
of this type of device is in a solar furnace, the object to
be heated is place at the focus point of the mirror. In this
case, the law of reflection is maintained.