In geometric optics, light rays can enter a (finite) prism of constant refractive index, and bounce off the edges as long as the incident angle is less than the critical angle of the medium.

Light on prismexperiment

Monitor visible light levels anywhere with fast, stable and accurate response. Results are easily read on the extra large LCD (1½" high) with bar graph, low battery and over range indications. The color and cosine corrected sensor meets C.I.E. photopic spectrum. Will read LED light. Also features RS232 computer output, min/max, auto power off, external zero adjustment, hold function and a tripod back. The lux / footcandle light meter comes ready to use with a 9V battery, instructions, soft padded case with shoulder strap, and a detachable sensor (not for submersible applications) with a 44" cord with cover for easier replacement or repair.

Also, the light cannot be generated inside the material. It must come from the background material. This means that the first angle inside the material must be less than the critical angle.

Light on prismequation

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Monitor visible light levels anywhere with fast, stable and accurate response. Results are easily read on the extra large LCD (1½" high) with bar graph, low battery and over range indications. The color and cosine corrected sensor meets C.I.E. photopic spectrum. Will read LED light. Also features RS232 computer output, min/max, auto power off, external zero adjustment, hold function and a tripod back. The lux / footcandle light meter comes ready to use with a 9V battery, instructions, soft padded case with shoulder strap, and a detachable sensor (with 44" cord) with cover for easier replacement or repair.

Dispersion oflightthroughprism

Yes, if you ignore the imperfect reflectivity of mirrors, loss of energy to heat, and scattering inside the device. I suspect there are actually many ways to do this, but one would be to:

One way to think about your problem is as an optical cavity, and the sides of the prism as partially reflecting mirrors. How ever since the reflectivity of the interfaces is low, it is hard to build up a large photon population in the prism and you also have the issue that when you are in equilibrium as many photons are leaving as you are putting in.

Light on prismformula

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A better way is to use total internal reflection, but then you have the issue of how do you get light into the prism. The figure below shows one scheme used for a spectroscopy technique where you can couple light into and out of the hexagonal prism using other prisms. You can certainly trap light inside the cavity for measurable lengths of time, but you still have scattering or absorption losses. In this case the squiggles at a,b,c,d are molecules on the prism surface that would interact with the evanescent wave increasing the absorption.