Abstract
Frustrated Total Internal Reflection FTIR phenomenon is manifested employing Newton‟s rings setup generated via a coherent light beam of a laser diode ( . All concentric bright and dark rings, except the central bright spot, were noticed to recede (disappear) when the incident angle exceeded the critical angle of 41o.It was also shown that the current setup has proven its applicability for other tests and can give convenient results that conform with theory. Neither the concept nor the design is beyond what can be realized in an undergraduate laboratory. However, technical improvements in mounting the prism - lens may be advisable. As an extension of the experiments, the effect can be studied using hollow prism filled with liquids of different refractive indices for both S and P polarizations of light. Also, the relationship of wavelength on the penetration depth can be explored.
Highlights
Introduction & principlesTotal Internal Reflection TIRIn the usual situation, when light encounters a boundary between two media of different optical densities, i.e., different refractive indexes () such that at any angle of incidence with the normal to the interface, there will always be a calculable angle of refraction
Newton‟s rings multiple - beam interference pattern occurs due to the superposition of the light waves reflected from the curved surface of the plano – convex lens and the top surface of the glass plate
As soon as the incident angle crosses over the critical angle, all the rings recede from the screen, leaving only a bright spot at the center of Newton‟s rings, Fig. 3 (i)
Summary
Introduction & principlesTotal Internal Reflection TIRIn the usual situation, when light encounters a boundary between two media of different optical densities, i.e., different refractive indexes () such that at any angle of incidence with the normal to the interface, there will always be a calculable angle of refraction. . This angle is called the critical angle, and above it light will be total internally reflected (Both polarization reflectance and become unity). It can be shown that, even in the case of total internal reflection, Snell‟s law still holds, except that the sine of the transmitted angle becomes greater than
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