Anti Reflection Coating (ARC) - Spectacle reflections, Multilayered coating.

[@anilbhosale1433]

Very nice explanation, but we add the polarised function on the A R C glasses please send some information.

[@shirolkarsv]

Very informative - Thank You

[@OPTOMETRYWITHTARIK]

Thank you for your appreciation

[@AyantikaTEN10]

Very good explanation But the work of polarized glass & anti reflection glass is the same? The difference is that polarized is available in different colors and ARC glass is available in white? What the difference?

[@OPTOMETRYWITHTARIK]

No the function is different Polaroid are lenses which block the rays of light coming at certain angle which creates glare Where anti reflection coating reduce the reflection on your surface there by increasing the transmission of rays

[@pranjalisurange943]

Is the constructive interference and distrucive interference are principle of ARC coating?

[@OPTOMETRYWITHTARIK]

Constructive leads to more reflection and destructive reduces it

[@AbhishekSingh-lu8tw]

@@OPTOMETRYWITHTARIK Tinted glasses decrease the trasmittance, ARC increases the transmittance (blocking reflection)

[@ВоронМаусы]

Can someone please help me? Why does anti reflection coating of lenses have to be a quarter of the wavelength of light, if both of the reflected waves (from the first surface and the second surface) will undergo 180 degree phase change? Won't they interfere constructively in any way, despite the thickness of the coating, since the reflected rays will be exactly the same as the incident wave, except they BOTH will be 'flipped upside down', having the same phase (no phase change between the two reflected waves)? Both of the reflected waves should undergo 180 degree phase change and therefore, interfere constructively.

[@OPTOMETRYWITHTARIK]

When two rays are out of phase by 180 degree they create destructive interference leading to less reflection of light from the surface

[@ВоронМаусы]

@@OPTOMETRYWITHTARIK Thank you very much for responding. I know that. I don't understand how the reflected waves become out of phase by 180 degrees, if both of the reflected waves (from surface of the AR coating and from surface of the lens) are initially have a phase change of 180 degrees between them

[@OPTOMETRYWITHTARIK]

@@ВоронМаусы As the ray gets reflected from coating surface and lens surface with certain delay due to thickness which makes both rays out of phase.

[@ВоронМаусы]

@@OPTOMETRYWITHTARIK yeah, already know that, but it doesn't make sense when it comes to visualisation. The reflected waves should always have the same phase, if both of the reflected waves travel back along the same path as the incident wave, just flipped upside down

[@ВоронМаусы]

@@OPTOMETRYWITHTARIK it's quite difficult to explain what I mean without diagrams. Is there any chance I can get your email address to send you the diagrams?

[@shrutipatel9993]

Hello Sir can you share this ppt ?

[@AbhishekSingh-lu8tw]

So, you are saying ARC glasses don't need scratch resistant cutin coat! If yes, they also create constructive interference in ARC glasses

[@OPTOMETRYWITHTARIK]

The concept of arc is destructive interference the are applied as the path and amplitude condition to reduce reflection and prior the arc a lens is hard coated 1st

[@AbhishekSingh-lu8tw]

Sir, Can you explain how ARC increase transmittance of light (reducing antireflections as written in books)?

[@OPTOMETRYWITHTARIK]

Hi Abhishek I would explain with simple example Let's say 100% light was incident on a surface and 6 percent gets reflected so the transmission is 94 But if we apply a antireflection coating it reduces the reflection let's say it becomes 3 percent so now the light transmission is 97 I hope this would help you to understand

[@AbhishekSingh-lu8tw]

Why do we do thin coating of Cutin on lens, which results in Unwanted reflection. Why not we keep lens uncoated!

[@OPTOMETRYWITHTARIK]

Uncoated lens will be prone to scratches an even an uncoated lens will have reflection

[@AbhishekSingh-lu8tw]

@@OPTOMETRYWITHTARIK how an uncoated lens will have unwanted reflection ,if you said it is because of the very thin layer outside it which creates double reflection?

[@AbhishekSingh-lu8tw]

@@OPTOMETRYWITHTARIK Can't we keep cutin coating with the same wavelength (1/4th of light or multiples of 3 used to create ARC) ?

[@OPTOMETRYWITHTARIK]

Both the condition path and amplitude have to be obeyed to create anti reflection

[@abhijitdas-si2fc]

Please make the Hindi vedio sir

[@OPTOMETRYWITHTARIK]

Abhijit Da sure