All Questions
Tagged with optics geometric-optics
1,082
questions
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Efficiency of light collection of a lens
I am trying to calculate the theoretical imaging performance of a scintillator & camera combination, (scintillator is a plane that emits optical light under X-ray exposure).
My question is I found ...
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Why is there no "parabolic abberation" in lenses?
I am trying to understand what an "ideal" lens would look like. Spherical surfaces are not correct, as these produce spherical aberration.
This article here, is really useful. It 'derives' ...
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2
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Can any mirror arrangement give an optical advantage?
I'm trying to see tiny movements in a membrane using a laser spot that shines on it, and looking at the reflected spot. I was wondering if it is possible for any plane mirror arrangement to give me ...
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Snell's Law- Extraordinary ray
I applied the snell's law to find the angle of refraction of the Ordinary and Extraordinary ray. And I got the correct answer 3.51. But I know my approach to the question is wrong because I applied ...
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1
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About the focal length and $f\#$ of spectrometers
Suppose I image light into the entrance slit of a spectrometer (actually a monochromator).
The spectrometer is schematically shown below.
On the spectrometer's specs sheet, it is said that it has a ...
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How would a lens mirror work?
Say you have a convex lens with one of the sides completely coated with a mirror like substance, effectively rendering one side into a mirror. How would this lens work? Would the usual formulas like $\...
- 135
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What is the use of $4f$ lens system for imaging?
Almost all the imaging experiments use $4f$ lens combination for imaging. What I don't understand is what is there a need for this combination. From my understanding, we can just use a convex lens. ...
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If a white light is incident on a thin prism, that means all colors have the same incident angle
If a white light is incident on a face of a thin prism, then all colors have the same incident angle. A dispersion occurs in the prism, but only the ray of one color will be parallel to the base of ...
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What shape should the lens be so that it collects all the rays at one point?
I want to understand what shape a biconvex lens should be so that it collects all the rays at one point (without spherical aberration). So I want to get the equation of the lens shape depending on the ...
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2
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447
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How does 2f-2f lens configuration work?
Say I want to image a shape which is cut out on an Aluminium sheet. If I am passing a laser through the object in a setup like the image below. What I don't understand is why is there a need of ...
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Perceived visual size of non-zero-sized collimated light source
Posting as a follow-up to my previous question where I modelled the system in question incorrectly, and therefore the question now completely changes with the physical model corrected.
Suppose I have ...
- 135
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Perceived visual size of collimated image
Suppose I have a light source which reflects off a collimating curved mirror into the eye.
Knowing the size (d) of the final collimated beam focused at infinity, how can I determine the perceived ...
- 135
2
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1
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Is the ray model appropriate only for spherical/planar waves?
In ray optics, light propagation is modeled using rays, i.e., curves that are perpendicular to the wavefront. In general, rays can be curved; however, if the medium is homogeneous, it follows that the ...
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How does rotating a beam splitter (cube) affect the output angles?
Normally, you would want to place a beam splitter at 45 degrees with respect to the input beam. This way, it splits the light 50/50 and the output beams are aligned for sure. Like this:
Now, I want ...
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Working principle of Shack-Hartmann Wavefront Sensor
(Image source: https://www.thorlabs.de/newgrouppage9.cfm?objectgroup_id=5287)
In the Shack-Hartmann wavefront sensor, the local slope of the incident beam's wavefront is measured as a displacement of ...
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