Parameters which are used to indicate the performance of AR coatings often include values for Bayer Ratios, indications of Adhesion, Resistance to Crazing etc.,(important of course). One parameter which is almost always downplayed though is the Reflectivity. Can anyone enlighten me as to why this may be?
Since the coatings are designed to be anti-reflective, you might expect this to be of paramount importance. It often seems that the reflex colour (a cosmetic property) is more important than the degree of 'antireflectiveness'. It also seems that as long as the average Reflectivity over the visible spectrum is reasonably low, that it is acceptable for there to be a relatively powerful beam of coloured light reflected over a more narrow part of the spectrum.
Am I just being cynical when I am almost dazzled by a flash of green (for example) when someone's 'antireflective' coating just catches the light as they turn their head?
Falstaff (grumpy old man)
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