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Prove thatwhen a reflectingsurface of light by an angle theta, the reflected light will be tited by an angle 20. |
Answer» Solution :For the reflecting SURFACE AB. The incident ray IO and the reflected ray `OR_(1)` subtend angle I with the normal N as angle of incidence is EQUAL to angle of reflection. When the surface AB US tilted to A.B. by an angle `THETA`. Remember the position of incident ray IO remains unaltered. But, in the tilted system the angle of incidence is now `i+theta` and the angle of reflection is ALSO `i + theta`. NOw, `OR_(2)` is the reflected ray. The angle between `OR_(2) and OR_(1)` is `angleR_(1)OR_(2) = angle N.OR_(2) - angleNOR_(1)` 
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