Total Internal Reflection

Total Internal Reflection

C022/1837 Rights Managed

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Credit: GIPhotoStock/SCIENCE PHOTO LIBRARY

Caption: When light travels from a more optically dense medium to a less optically dense medium and the angle of incidence exceeds a certain value, called critical angle, all the light is reflected back to the more optically dense medium and no light enters the less dense medium except a very thin layer near the surface (evanescent wave). This effect is called total internal reflection. In this photograph a diode laser beam (635 nm) is totally internally reflected at the interface between a transparent acrylic slab and air. The acrylic slab is specially formulated to scatter some light and make the beam path visible from the side. Digitally manipulated.

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Keywords: 635 nm, acrylic, angle of incidence, beam, coherent, critical angle, demo, demonstration, diode, diode laser beam, educational, effect, experiment, geometric, laser, light, monochromatic, monochromatic light, observation, optical, optical phenomenon, optics, photonics, physics, ray, red laser, reflect, reflection, refractive index, scientific, tir, total internal reflection, visible, wavelength

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