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Light Is A Form Of Energy And Composed Of Different Wavelengths

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Light is a form of energy and composed of different wavelengths. When the light exposed to an object, the light could be reflected at the surface of the object (specular or diffuse), and it could be absorbed or scattered within the object, or it could refract or totally transmitted through the object44, 45. The wavelengths (colors) that are reflected, refracted or transmitted are perceived by receptor cells (i.e. rods and cones) in the eye and recognized by the brain as a specific color. The wavelengths of visible light range from approximately 400 to 700 nm45, 46. The wavelengths that are transmitted, refracted or reflected create the color that is perceived and till about the translucency level of the material. If all light is transmitted, the material will appear completely transparent. If all light is absorbed, the material will appear completely opaque, and the color black is perceived. However, if some of the wavelengths of visible light are absorbed and others reflected, refracted, or transmitted, the color that is perceived corresponds to the wavelengths that are reflected, refracted, or transmitted, and the level of translucency is depend on the amount of the light that transmitted through the material9, 44-46. Moreover, the reflection of the light depends on the surface texture of the restoration. Thus, a smooth surface increases the specular reflectance, in which the angulation of light reflection is equal to the angle of the light source. This reveals more of

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