![]() So, students sometimes get confused with this. Note: The appropriate answer would be all the given options, since the total internal reflection along with the cut and shape of the diamond results in the brilliance of it. Vi) Hence, the main reason behind the brilliance of diamond is the total internal reflection of light, while the cut and shape boost the process. When the diamond is viewed from these angles, it sparkles brilliantly. As a result, all of the light entering the diamond goes through several internal reflections and exit only in some particular directions. To maximise the effect, the diamond is processed and is finely cut in some definite shapes. V) However, this alone isn’t responsible for the sparkle of diamond as can be seen in an unprocessed diamond. As a result of this low critical angle, more than 70% of all the light hitting at different angles has the possibility of getting totally internally reflected causing multiple reflections inside the diamond. ![]() Due to this high refractive index, the critical angle for diamond is 24°. Iv) Diamond has a refractive index of 2.42. ![]() Iii) The sine of critical angle is inversely proportional to the refractive index of the denser medium. This phenomenon is called total internal reflection. Ii) Beyond this angle of incidence, all of the light hitting the interface gets reflected back. This angle is defined as a critical angle. As the angle of incidence is increased, the bend increases and at some angle the refracted light is so bent that it grazes along the interface. I) When light passes from the denser medium to a rarer medium, it bends away from the normal. Diamonds are processed to maximize the effect of reflection. The idea of total internal reflection needs to be considered. Uncut diamond doesn't look as bright since the angles of incidence isn't made to be beyond the critical angle.- Hint: Diamond when seen at certain angles sparkles brilliantly, as all the light entering emerges through those directions. So a greater percentage of the incident light gets internally reflected several times before it emerges from the diamond, making the diamond look really shiny.Įdit : As has also mentioned - It's also the shape that matters to the shiny-ness. This doesn't always happen, there is some total internal reflection happening, but the 'critical angle' for glass is really high so you don't usually see it happening.īut diamond on the other hand has a really high refractive index ($\approx 2.4$) and because of that the critical angle for total internal reflection to occur is much smaller. To draw a comparison with glass : In glass (for the most part) when you incident light onto it, it gets refracted on one surface, and gets refracted again at the other surface and leaves the material. You could also have a look at this link for more information. The phenomenon you're looking for is called total internal reflection. There are youtube goodies regarding the topic. Also, the incident angle should be far high above thee critical angle. Note: For total internal reflection to take place, light must travel from an optically denser medium to a relatively rarer medium. The second figure shows the reflections inside ideal cut, deep and shallow cut diamonds. The first one shows the mechanism of internal dispersive reflection. At the surface which separates air & diamond media, the incident angle $2$ is very well above the critical angle ($c_a$) and simultaneously ($3$ & $4$) the reflection takes place at different surfaces of the diamond. When the light is incident at an angle $1$, it refracts inside and travels through the lattice. Want to thank TFD for its existence Tell a friend about us, add a link to this page, or visit the webmasters page for free fun content. Due to this fact, diamond is an important application in optics.Ĭonsider an ideal cut diamond. Websters Revised Unabridged Dictionary, published 1913 by G. The refractive index of diamond is pretty high ( 2.417) and is also dispersive (coefficient is 0.044). ![]() What you've shown a round brilliant cut diamond.Īctually, the secret that's rattling inside a diamond is refraction, total internal reflection (not to be confused with ordinary reflection) & dispersion. A diamond (crystalline in nature) has a three dimensional arrangement of carbon atoms linked to each other by strong covalent bonds. We know that it's an allotrope of carbon. ![]()
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