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"Progress, therfore, is not and accident,¡K" ..."Herbert Spencer(1820-1903, British philosopher)"

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ahmedelshfie
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 « Embed this message on: June 09, 2010, 02:09:32 am » posted from:SAO PAULO,SAO PAULO,BRAZIL

This following applet is Law of reflection
Created by prof Hwang Modified by Ahmed
Original project Law of reflection

The law of reflection tell us:
The angle of incidence equals the angle of reflection.
If you change the orientation of the mirror by angle X,
the angle of incident and the angle of reflection will both change X.
So, the angle of the reflected ray changes by 2X.
You can drag the light source(with mouse) to change the incident angle,too

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ahmedelshfie
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 « Embed this message Reply #1 on: June 26, 2010, 12:04:12 am » posted from:SAO PAULO,SAO PAULO,BRAZIL

Reflection is the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated. Common examples include the reflection of light, sound and water waves. The law of reflection says that for specular reflection the angle at which the wave is incident on the surface equals the angle at which it is reflected. Mirrors exhibit specular reflection.
In acoustics, reflection causes echoes and is used in sonar. In geology, it is important in the study of seismic waves. Reflection is observed with surface waves in bodies of water. Reflection is observed with many types of electromagnetic wave, besides visible light. Reflection of VHF and higher frequencies is important for radio transmission and for radar. Even hard X-rays and gamma rays can be reflected at shallow angles with special "grazing" mirrors.
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ahmedelshfie
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 « Embed this message Reply #2 on: June 26, 2010, 12:05:59 am » posted from:SAO PAULO,SAO PAULO,BRAZIL

Laws of reflection
If the reflecting surface is very smooth, the reflection of light that occurs is called specular or regular reflection. The laws of reflection are as follows:
1- The incident ray, the reflected ray and the normal to the reflection surface at the point of the incidence lie in the same plane.
2- The angle which the incident ray makes with the normal is equal to the angle which the reflected ray makes to the same normal.
3- Light paths are reversible.
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"Progress, therfore, is not and accident,¡K" ..."Herbert Spencer(1820-1903, British philosopher)"