What Is Photonics and How Does It Involve Manipulating Photons?

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I have read a lot of articles on photonics, but this field is very board.

How would you classify what photonics is?
 
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Photonics is the science of light, of manipulating photons (much how electronics is the science of manipulating electrons).

Claude.
 
I would like to use a pentaprism with some amount of magnification. The pentaprism will be used to reflect a real image at 90 degrees angle but I also want the reflected image to appear larger. The distance between the prism and the real image is about 70cm. The pentaprism has two reflecting sides (surfaces) with mirrored coating and two refracting sides. I understand that one of the four sides needs to be curved (spherical curvature) to achieve the magnification effect. But which of the...
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