| OCR Text |
Show 33' Diagrams (b) these instances and only a (c) show different degrees of specular reflection. certain percentage of the light is said to be diffused; the remainder is specularly reflected. directional phenomenon, of the observer to the represent plane In the light As the reflection brightness intensity depends and source diagrams specular of to the surface. The specular reflection of light is well a known The is light the relative on brightness intensity for .of position dashed curves certain incident a phenomenon in a angle. and optics it follows the Fresnel Reflection law. III. 2 Fresnel Law, of Reflection If the the surface strikes light percentage of the intensity of of case some reflected,' dielectric materials At other with at first angle, ,incidence" defined light 4 per only at the as then all of the light which ratio of or cent more more is the rapidly reflected. the reflected of of the reflecting The and the For 3.3. III. 3 more Practical Let of area us ds, light source. detailed An example of discussions, a reflection Jenkins & White see increases degrees, the "grazing over on the light under power reflection light intensity light, is incident incident until 90 small a For example, in the the intensity plotted against the incident angle, depends both object only incidence, is reflected. of incidence angles slowly and normal beam of but metals reflect 80 per cent conditions. same a at is the incident light of the the nature is curve which curve, given on Figure [26]. Applications beam of take an example of with an incident angle i. a light falling on a piece of material Let the incident energy ei be the energy |
