Line of Polarizers Reflection Question

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A row of polarizers reflects light waves when the pitch matches the wavelength due to constructive interference, where light of the same wavelength and phase reinforces each other. This phenomenon occurs because the reflected light aligns in phase, enhancing its intensity. Conversely, light of different wavelengths experiences destructive interference, leading to reduced reflection. The discussion also raises questions about the effects of phase differences in incoming light on this reflection process. Understanding these principles is key to grasping the behavior of light in polarizing systems.
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http://plc.cwru.edu/tutorial/enhanced/files/lc/phase/Graphics%5Cschem.BMP
I was hoping someone could help me with understanding why a row of polarizes reflects a light wave when the whole row (the pitch P) is the same length as the wavelength of the light.

[PLAIN]http://www.aetherwavetheory.info/images/physics/color/cholecteric_color.gif[PLAIN]http://www.battlesnake.co.uk/_uni/lcd_files/image006.gif

I prettymuch get the physics behind the rest, just don't understand this little part. Why only the light of that length and does this also apply for light coming in at a different phase than the crystals?
 
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So I've been reading my optics book (again) and came on an insight, could it be because all the reflected red light is in the same phase and has constructive interference while all the other light has destructive interference?
 
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