Light and Mirrors

About light and mirrors. Incidence, refraction etc.

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  • Created by: Plagarate
  • Created on: 05-06-11 11:52
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Light and Mirrors
Light is a type of wave, which can only travel in straight lines.
A wave can be measured
The AMPLITUDE is how `high' the wave is the distance that the undisturbed wave is
disturbed. It's NOT the distance from the top to the bottom, but it's the distance from either
the top or the bottom to the middle. It is measured
The WAVELENGTH is the distance between two corresponding points on the wave. It is
always measured in METRES.
The FREQUENCY is how many waves pass by every second, and is measured in HERTZ
Light is a TRANSVERSE wave. This means that the oscillations occur at RIGHT ANGLES
to the DIRECTION the wave is travelling in. It travels extremely fast ­ around 300,000km
per second ­ MUCH faster than sound.
Shadows are places where light is `blocked'.
We see things because they reflect light into our eyes.
The incident ray is the INCOMING light ray.
The NORMAL is the line at a right angle to the
The reflected ray is the ray that is reflected.
The angles are the angles created between the
rays and the normal.
The Angle of Incidence is ALWAYS equal to
the Angle of Reflection.

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Everything in the reflected image is
positioned exactly as in the man's
Light rays from the object reflect off the
mirror and reach the man's eyes,
following the path of the solid green
lines. Because the man's brain knows
that light normally only travels in straight
lines, the light appears to be following
the red dotted lines ­ the brain
misinterprets the signals and `sees' the
image behind the mirror.…read more


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