A glass is transparent but our sense of sight tells us every time we come across one. It is because of some of the light passing through it being reflected back to into our eyes. But what if it doesn’t?
A Japanese firm; Nippon Glass Co. limited has been successful in reducing the amount of reflection the light rays face when passing through a normal glass. The development renders the glass practically invisible. The product was exhibited at FPD international where the visitors were left surprised when their eyes couldn’t make out the presence of glass in front of them.
Our eyes can see an object only when light from the object is reflected back into it. The lesser the reflected light rays, the blurr the image, and thinner the chances of our brain to comprehend it.
Working on the same principle, Nippon’s scientist built a non-reflecting film on both sides of the glass. In case of the normal glass, the substrate allows 92% of light rays to pass through while reflecting back the rest 8%. The film thus produced reduces this amount to 99.5%, which means only 0.5% of the light is reflected back.
The company claims the substrate with anti-reflection film on it to have a luminous reflectance of 0.1% or lower. About thirty layers were used for both the anti-reflection films and thickness of each had to be controlled sophisticatedly and vigilantly by the increments in the order of nanometers.