All Questions
Tagged with photonics geometric-optics
9
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Does the beam image invert on each round-trip through a hemispherical laser cavity?
When one creates a hemispherical laser cavity, using one flat and one concave mirror, does the beam image invert each time it makes a round trip? I know when passing through the focus of a lens/mirror,...
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1
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How can I find the angle after the last lens from in the last lens?
I want to find the angle after the last lens when the beam diffracts. How can I do that? Is it the field of view? But for the field of view formula it takes account the size of the sensor. I want to ...
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2
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475
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Ghosting/Unwanted refection with cube beam splitter
I am new in working with an optical setup. I have a small setup to mimic a 3D printer motion stage.
So, it consists of a laser hitting on a cube beam splitter. The transmitted one is dumped while the ...
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1
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The sides of a spoon as concave/convex mirrors
I recently saw a lecture that said the following regarding the sides of a spoon as concave/convex mirrors:
The concave inside of the spoon must be a positive focal length mirror because it would take ...
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Lens focusing a collimated beam into a disk of some material. Focus shift due to movement of material?
I encountered a geometric optics problem that gave the example of a lens focusing a collimated beam into a disk of some material with refractive index $n$. It then claimed that, if the disk moves ...
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Why is the ray equation invalid at the edge of a plane wave traveling through a pinhole?
I am currently studying geometrical optics, and it is stated that the ray equation is invalid at the edge of a plane wave traveling through a pinhole. I know that, when the amplitude of the wave is ...
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Rays and the ray equation: behaviour in optical systems, valid solutions to Maxwell's equations
In my studies of geometrical optics, I have encountered variations of the claim that, from what I recall, when the amplitude of the wave is changing slowly, the ray equation is a valid solution to ...
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Phenomenon of waves transforming at focus
In the following image, we have a plane wave that travels through a lens, such that it comes to a focus:
As we can see, the lens transforms the plane wave into a convex wave. But once the convex wave ...
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2
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Explanation: When light waves propagate through and around objects whose dimensions are much greater than the wavelength of the light,
My textbook, Fundamentals of Photonics, 3rd edition, by Teich and Saleh, says the following:
When light waves propagate through and around objects whose dimensions are much greater than the ...
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