Thin-film interference (TFI) is a process that causes certain frequencies of incident light to be magnified (constructive interference) while other frequencies cancel (destructive interference) when light reflects off a membrane with an inner and outer layer. When the thickness of the membrane is just the right thinness, the process of TFI can turn white light into the colors of the rainbow.
TFI is the same phenomenon that causes color in soap bubbles and oil films. To view the phenomenon in the Pipevine it is handy for them to land with wings facing the sun. source:)
Like many of the black swallowtails, the Pipevine Swallowtail has pretty orange spots. The orange color is caused by deposits of pigment. The Pipevine also glows a blue color when viewed in bright sunlight. This is not caused by pigment but rather by a process called Thin-Film Interference (TFI). More:p
Basically one theory of light is that it is an electromagnetic wave. Just like under the right conditions sound waves can cancel each other out, light waves can also cancel each other out. Noise canceling earphones work by generating waves that cancel out noise. The physics term for this is destructive interference. hor/more in punjabi
White light contains a broad spectrum of light waves. In other words each color has a differnt wave length and frequency. The speed of a wave equals the wave length times the number of waves per second (frequency). In a vacuum, all light waves move at the same velocity. Therefore as the wave length gets smaller, the frequency has to get higher.
A film is a reflective layer that has an inner and outer surface. If the distance between these layers is in the range of a wavelength of light then the conditions to cause TFI, i.e. wave cancellation or amplification, is ripe. Since reflected light has to travel into and out of the mebrane, it travels twice the distance of the membrane thickness. That is called 2d in the reference. If this distance is equal to one wavelenth (or an even number of wavelenths) then the waves will add together and be brighter. If this distance is exactly half a wavelength (or an even multiple of this) then the waves will cancel each other out.
Accidentally yani hadsati tor per I have some shots are example of TFI Share your TFI images too Never let anyone burst your bubbles or dreams.
I've seen glare on digital photos, but not TFI ... I think we need to dig out some old silver nitrate photos to demo this ...? Is that right Bushra?
Bat yeh hai main kisi dosey ki tasweer tu postkerny se rahi misal ke tor per bhi. Ijazat wijazat hasil ker ke kern ameri shan ke khhilaf hai:p Baqi yeh perh ker mery zehan main ju misal aai woh yeh thi baqi agr aap ke pas koi better example hai tu post ker dain ijazat ki ya pochny ki kiya zarorat hai More Explanation bhi ker dijey ga :D
Aap ki tasweerain (jo pehlee post mein hein) thorisee misleading theen ... they showed bubbles in pictures ... bubbles made from a bubble making machine ... lekin ... TFI is a real phenomenon of photographs ... I was asking that they really only appear on older photographic film not the new digital photos ... I was not sure so asked if you may have any examples of TFI on digital photos ... so I can be sure ...
Yes ... I have some pictures of my youth that have TFI on them ... I'll find them and post here.
Aap ki tasweerain (jo pehlee post mein hein) thorisee misleading theen ... they showed bubbles in pictures ... bubbles made from a bubble making machine ... lekin ... TFI is a real phenomenon of photographs ... I was asking that they really only appear on older photographic film not the new digital photos ... I was not sure so asked if you may have any examples of TFI on digital photos ... so I can be sure ...
Yes ... I have some pictures of my youth that have TFI on them ... I'll find them and post here.
Itni sure tu main bhi nahi thi koi Ustad Jee nahi hon. Waisy yahan aikkafi manjhey hoey photographer hotey they woh kahan hai aj kal HDR expert. Woh ustad kehlaney ke haqdar they :D
Any ways mera naqis khiyal tha ke Bubbles are white but jab camera se li gai main colors alag lag nazar ain tu wohi nature's interference hu gi so white bubbles main reflect honey waley sat rang mery liey thick film interference ki misal hain.baqi waAllah hu Alam
After research and viewing these videos I believe You can see evidence of thin film interference on digital photographs too. One of the video is digital and it also shows color produced through TFI. Old style film cameras can also show color produced by TFI. So my pictures were not misleading. It showed the color in a soap bubble produced by TFI. Eeven bubble maker used for the purpose but soap water used for that so you use old tradintion blower and blow with mouth or use machine what’s the difference?and why it should not consider TFI? PS: Waitng for yur pics; Qiyamat se pehly post hu jain gi??
Share your TFI images too 
