enter image description here What is the rule-of-a-thumb ratio of lens' thickness to wavelength at which they can be designed using ray optics approximation? (The thickness is more relevant to gradient index lens, homogeneous lenses can be made arbitralily thin provided that you have a high enough refractive index material) Since lenses often have nontrivial shape, for simplicity sake let's consider a flat plate gradient index (otherwise it wouldn't be a lens) lens as shown on the picture. How many wavelengths thick at least should it be for the light to apparently take the path predicted by path integral?


closed as unclear what you're asking by sammy gerbil, Daniel Griscom, David White, rob Jul 20 '18 at 20:56

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  • $\begingroup$ Hi, welcome to Physics SE! Unfortunately, the question in its present state is off-topic here. We intend our questions to be potentially useful to a broader set of users than just the one asking, and prefer conceptual questions. Can you try making a question about some concepts that you'd need to solve this problem? Also mention any thoughts you currently have about the solution, and your assessment of their usefulness. $\endgroup$ – user191954 Jun 25 '18 at 13:56
  • $\begingroup$ Am i supposed to edit this one or can i post a new question? $\endgroup$ – Zahid 'lera Jun 25 '18 at 14:01
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