All Questions
Tagged with optics geometric-optics
1,082
questions
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Finding magnification of microscope from focal lengths
How do you find the magnification of a microscope given the focal lengths of the objective and eyepiece? What else can you find given this information? If finding the magnification is not feasible ...
- 187
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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
answer
77
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Mathematical definition of ray
I have just begun studying geometrical optics, and there is something mysterious about it.
What I want to know is how to derive the definition of ray from Maxwell's equation.
In vacuum, ...
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68
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Finding the limiting refractive index of a rainbow
Give the limiting refractive index of a rainbow.
The raindrops are modelled as spherical droplets, with refractive index $n$, with parallel rays from the Sun incident on it. I have a very limited ...
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What would I observe with a light microscope operating at its full magnification if the specimen was smaller in diameter than the used wavelength?
Would I still see the specimen but completely blurry? or wouldn't I see it at all? For example, let's say the wavelength of the light used is 600nm and the diameter of the specimen is 550nm.
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Object and Image Distance from Image height, Object height, and focal length [closed]
Is there a way to find the object and image distances from the object height, image height, and focal length? I understand that the magnification is equal to $-\frac{d_i}{d_o}$ or $\frac{h_i}{h_o}$, ...
- 187
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How is a complete image of a distant object formed with an obstruction in the line of sight? [duplicate]
Can anyone please link to or sketch a diagram demonstrating how a complete (and clear) image can be formed of a distant celestial object with a central obstruction blocking part of the line of sight ...
- 101
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How do you derive the formula's for equivalent focal length and back principle plane for 2 thin lenses separated by a distance?
I've found online that the formula for the effective focal length of 2 lenses separated by a distance is:
$$
\frac 1f=\frac 1{f_1}+\frac 1{f_2}-\frac d{f_1f_2}.
$$
However, I'd like to know how this ...
- 101
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Input Parameter Location for 3x3 Beam Trace Matrix for Misaligned Optical System
I'm trying to use a 3x3 beam transfer matrix from "Generalized Beam Matrices: Gaussian Beam
Propagation in Misaligned Complex Optical Systems" by Anthony A. Tovar and Lee W. Casperson https:...
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1
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85
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Michelson interferometer but with 1 arm
If we design a setup similar to Michelson Interferometer but with one mirror only. So, there is an angle between the 2 rays to the detector. Will we get an interference pattern on the screen?
- 81
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Printing 2d fresnel zone plate
Recently my teacher asked me to create a Fresnel zone plate (Fresnel lens to be accurate).
I wanted to print it using a laser printer with a resolution of 1200*1200 dpi. I know that i should block ...
2
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1
answer
201
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Lenses and missing reflection
I am wondering why reflected rays are not considered with lenses. If a ray strikes a surface, another is reflected off that striking point; however, this is not added when studying lenses, only ...
- 23
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Final image formation in these 2 cases:
Can someone please explain simply how we determine how many times we have to consider reflection and refraction to obtain final image.
Example a:
Here they only considered refraction twice to obtain ...
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1
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84
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Keplerian telescope with parabolic mirrors
Is it possible to arrange two off axis parabolic mirrors (OPAs) to transform the emitted rays of a point source into a collimated beam, as in the figure below?
That is, similar to a Keplerian ...
- 117
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Dispersion of light without deviation
Why do we have dispersive angle in dispersion without deviation if there is no deviation from the original path?
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