Light Reflectance Mirror Lens

Light is a wave . One of the properties can be reflected wave is . If the light falling on a surface , partially reflected and partially transmitted or absorbed . Amount of light reflected or absorbed depends on the nature of the reflective surfaces . If the surface of a mirror , almost all the light is reflected . If the black surface rough , almost all the light is absorbed. An object can be seen as the objects reflect light into the eye .
Light has the reflectivity law reads :

a. Reflection angle ( r ) is equal to the angle of incidence ( i ) .
i = r

b . Rays come , light reflectance and normal lines lie in one plane and three intersect at one point .
 

Figure II.1 Illustration law reflectance of light

Based on the image II.1 above , it can be seen that the direction of the normal line is always perpendicular to the surface at the observed point . If the reflective surface in the form of a flat, smooth , normal line direction at various points together . However , if the surface area of ??a squiggly , normal line direction can be different at different points . Based on the state of the object surface reflects the light , the reflection can be divided into two types , namely :

a. Regular Reflection .
If the beam of parallel light , eg sunlight or flashlight , dropped on a flat plane , the beam fell at various points have the same angle as the direction normal lines are all the same , so that the reflection angle all the files are the same. As a result , the reflected light is also a parallel beam . Reflection is called regular reflection . Regular reflection the reflected beam resulting number is almost the same as the incident light beam . Therefore , regular reflection reflective surfaces will appear bright ( shiny ) .

b . Diffuse Reflectance .
If the beam of parallel light dropped on an uneven surface ( grooved ) , the direction of the normal line can be different at different points . As a result , the light beam falls at different points have come in different angles and being reflected at different reflection angles . Thus , the reflected beam no longer have a regular way . Reflection so called irregular reflection or diffuse reflection . Diffuse reflectance resulted pantulnya beam spread in all directions . Thus , the beam of light received by the eye just a little . As a result , diffuse reflectance surfaces do look bleak .

Human can see objects because light from the object into the eye . Objects in question could be a source of light , but can also be a dark object .

Light sources are objects that produce their own light , such as sun , incandescent lamps and candles . Humans can see light directly from the source of light it emits.

Dark matter is matter that does not produce its own light , such as planets , moon , rocks , soil and plates . Humans can see dark objects because these objects reflect light from the light source to the eye .

Light that enters the eye to form a shadow that gives the impression that the person sees things. If there is no light coming into the eye , the person can not see objects even if the object is very close to the person. For example , a pencil in a pitch dark room will not look at all although the pencil may be near us . The cause is not at all reflected light into the eye pencil .

If an object emits light , but there was no light coming into the eye , the object was not visible . For example , light walls . Although the lamps give off light , but because there was no light coming into the eye of it then the lights are not visible at all .

So , there are two conditions that an object can be seen by the eye , namely :
a. The objects emit or reflect light .
b. Light emitted by things that can be captured by the eye .