As noticed before, interference effects are most prominent when light interacts with something having a size similar to its wavelength. In nature. Double slit interference, described on the previous page, is rarely observed in nature. The wings of many insects act as thin films because of their minimal thickness. A N R1 R2 i F Air B G i D t θ θ µ M θ C Q i E Air i H T1 T2 Fig. Thus, two waves are now traveling up. This is due to interference of light reflected from upper and lower surface of the film via the method of division of amplitude. – A free PowerPoint PPT presentation (displayed as a Flash slide show) on PowerShow.com - id: 79b3ae-YWFmN In this lecture we will discover what causes this interference color and how it can be used to determine some of the optical properties of the crystal. Waves Polarized in the Same Plane. Let a parallel sided thin film of refractive index µ and thickness, ‘t’ be considered within an air medium. Using the method discussed in the previous section, there are always two parts to a question like this. When the privileged directions are not parallel to the polarizer some light is transmitted by the analyzer and this light shows a color, called the interference color. Structural coloration due to thin-film layers is common in the natural world. The optical properties of thin films arise from interference and reflection. 5.1. This interference is between light reflected from different surfaces of a thin film; thus, the effect is known as thin film interference. Interference of light by parallel sided thin film. However, a small part of the transmitted wave then reflects off of the lens, itself. The rest of the wave is transmitted. These two waves can interfere and we want to know whether there will be constructive or destructive interference. Interference due to the Transmitted Light. A thin film is one having a thickness t smaller than a few times the wavelength of light, λ. In, thin film interference refracted rays remain in-phase with their initial rays. thickness: (a) Reflection Pattern: Let us consider a thin film of thickness t, refractive index µ and a ray AB of monochromatic light of λ … The interference of light waves is a second strand of evidence. In the early nineteenth century, Thomas Young showed that the interference of light passing through two slits produces an interference pattern when projected on a screen. Niels Bohr. Interference due to transmitted light in thin films Non reflecting films Reflectivity is the fraction of incident light reflected by a surface for normal incidence. This is clearly visible in the wings of many flies and wasps. The Interference of Light. Hence, condition for brightness is 2 µt cos r = nλ and condition for darkness is 2µt cos r = (2n – 1) λ/2. Interference of transmitted light is completely constructive for these films. On the other hand, interference due to thin films is quite frequently observed - swirling colours on an oil slick, colours on a soap bubble, the purple tinge on an expensive camera lens - are all examples of thin film interference.

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