Optics is the study of light, and its interaction with matter. It includes topics such as imaging systems, fiber optics, lasers, quantum optics, and more.

learn more… | top users | synonyms

0
votes
1answer
244 views

Magnification for a concave mirror

Here is the question as given in my textbook: Find the distance of the object from a concave mirror of focal length 10 cm so that the image size is 4 times the size of the object. The solution ...
0
votes
1answer
112 views

Depolarisation of Light in Optical Fibre

I have a question for which I can't seem to find a solid answer in literature and wondered if anyone could offer advice or reliable references please: How does light depolarise in ...
0
votes
1answer
246 views

Laser action on one side mirrors (half silvered) and prisms

I know that half silvered mirrors are used in the production of laser emission. Can half silvered mirrors be used outside the instrument so the rays get reflected back on one side of the mirror and ...
0
votes
1answer
96 views

Is there a way to define a function of a meniscus curvate?

If you cut a thin slit in thin opaque material and then put it into water and pull it out, the meniscus will be formed in the slit. For my research I need to know if it is analytically possible to ...
0
votes
1answer
50 views

Circular polarisation

If we have a planar and harmonic EM wave, with $B$ field: $$B=A\left(\begin{array}{c} 1\\ i\\0 \end{array} \right)e^{-i(\omega t-\vec k\cdot\vec r)}$$ and with it's corresponding $E$ field. This is ...
0
votes
1answer
88 views

Is there a formula for determining the focal point of a sphere?

I guess this is the same as for cylinders, when light is shone through parallel to the cross-section, but Google-ing this only turns up lenses like the ones used in glasses. I'm looking for something ...
0
votes
1answer
671 views

calculating focal length of meniscus lens

As I read about telescope, distance between objective lens and eyepiece must be equal to addition of their focal lengths. D = F1 + F2 I used one of the eyepiece ...
0
votes
1answer
114 views

Ratio of distance between mirror and person

In perspective of a given example, if a man was to stand $2\ m$ away from a mirror which was $0.9\ m$ in height and was able to see his full reflection, what would the height of the mirror have to be ...
0
votes
1answer
871 views

How to determine real part of optical conductivity by reflectivity measurements?

In figure 3 of this document, there is data relating $\Re(\sigma(\omega))$ to the Fermi energy. It is claimed that $\Re(\sigma(\omega))$ is determined via reflectivity measurements. How is this done? ...
0
votes
1answer
173 views

Dichroism in uniaxial crystals

I need a same help with it. Some books where i can find a real math explanation of this effect will be good help!! simple exp of this effect will be good too)
0
votes
1answer
203 views

Image Formation (Convex-Convex lenses)

I'm given with these data: Lens 1 and lens 2 are convex lenses with different focal lengths Distance of object from lens 1: 50 mm Distance between lens 1 and lens 2: 100 mm Distance of final image ...
0
votes
1answer
673 views

Calculational method for determining surface tensions from photograph of menisci?

How can I get from a photograph of a liquid surface to a value for the surface tension.
0
votes
1answer
460 views

Dispersion & Absorption in Optics

1) I understand light dispersion. But, I wonder what happens if I used a lens to focus it into a small point. Would it be a white point (would it reverse dispersion) or would I have a multicolored ...
0
votes
1answer
324 views

Transmission of Gaussian Beam Through Graded-Index Slab

The $ABCD$ matrix of a glass graded-index slab with refractive index $n(y)=n_0(1-\frac{1}{2}\alpha^{2}y^{2})$ and length $d$ is $A=\cos(\alpha d)$, $B=\frac{1}{\alpha}\sin(\alpha d)$, $C=-\alpha ...
0
votes
1answer
681 views

Are silicone polymers transparent to infrared light?

I know that silicon and even black plastic bags are transparent to infrared light. What about light-colored silicone polymers (take white or green colors)? Are they transparent to infrared light too? ...
0
votes
1answer
973 views

How do Anamorphic images work? [closed]

I found the following anamorphic image on this site Can anyone explain the physics behind the working of such images? Can we create our own anamorphic images? If so how? Thanks in advance.
0
votes
1answer
131 views

How to estimate number of Laue Spot

Why are "Laue Spots" spots instead of rings? Or is there an effective way to estimate the number of Laue spots? I can't find any formulas or theory concerning this issue. Thanks for your attention!
0
votes
1answer
1k views

Rotation of parabola

I'm designing a parabolic solar concentrator and am doing ray-tracing on Matlab from scratch. I'm beginning to look into compound concentrators and would need to have an equation for a parabola ...
0
votes
1answer
620 views

How does the Fraunhofer irradiance distribution look for a double slit aperture of different lengths?

How does the Fraunhofer irradiance distribution look for a double slit aperture with $d$ = integer multiples of $b$?
0
votes
1answer
250 views

How to define the required aspherical coefficients for a lens?

I would like to purchase my own aspherical lens for testing purpose. Then I need to define the required coefficients. But how? My known requirements are f=25mm F/# 2.0 and MTF 0.5 @ 120lp/mm with a wl ...
0
votes
1answer
530 views

How do I get the focal length from a camera matrix?

Given the camera matrix, can I find the focal length of this camera ?
0
votes
2answers
273 views

Optical distortions and focus losses calculation

I'm working with a megapixel camera and lens that needs to be focused for an OCR application. In order to measure the focus quality during the set-up, I've built a tool that gives the contrast value ...
0
votes
1answer
16 views

Why the image is being formed at the surface?

Last week I encountered a very cool optical phenomenon. A photo was sandwiched between the two glass plate to make the paperweight. The cool part is the picture seems to have been pasted on the top ...
0
votes
0answers
5 views

Why is forward brillouin scattering difficult to observe?

Generally we talk of only the backward Brillouin scattering. And I just know forward scattering is difficult to observe? Why is it so? Does it have something to do with phonon life time? Is it ...
0
votes
0answers
26 views

Optics modelling software

I am looking for software that could allow me to model the internals of my spectrometer. I would imagine some sort of ray tracer that allows me to add mirrors, slits, gratings etc. This way, I can see ...
0
votes
0answers
11 views

Point Spread Function of a Complicated Optical System

suppose I image a point source using a single lens, then at its focus (image plain) I'll get a spot resembling a Fourier transform of the point. As far as I know, that is defined to be the lens's PSF. ...
0
votes
0answers
25 views

Fringe Localisation

How am I to understand where the fringes of a given setup are localised? For example, Young's double slits have non-localised fringes, that is the fringes are localised (and so are well formed) at ...
0
votes
0answers
48 views

Is it feasible for a lens of focal length of 1 meter to have a radius of curvature of 92.1 meters? [on hold]

Is it feasible for a lens of focal length of 1 meter to have a radius of curvature of 92.1 meters?
0
votes
0answers
14 views

Absortion of light by a plasma

Considering a plasma generated in a fixed volume by increasing the temperature of Helium gas from the environment temperature (this temperature is not stated) and an initial presure of 0.001 Torr, to ...
0
votes
0answers
35 views

Making a bright beam of artificial white light

For educational purposes, is there a way to make a narrow bright beam of white light without much equipment and without using the sun as the source? The collimated beam should be about 2 mm wide for ...
0
votes
0answers
25 views

Would an inverted design of a laser phosphor display (LPD) work?

Background info... It is my understanding that a laser phosphor display works by emitting RGB laser beams through a mechanism that cycles them in a pattern similar to a cathode ray tube. When I read ...
0
votes
1answer
20 views

Criterion for resolvability and spot size for optical systems

Look at the following table: By spot size I mean if we have a point source for the object, the angular radius of the spot created by the source as viewed in the image plane. My question is is all ...
0
votes
0answers
35 views

Optical fibers: pulse spreading in an optical fiber due to material dispersion [closed]

I am a newbie to the world of lasers and optical fibers and was working my way through some basic problems, when I encountered this one: Calculate the pulse spreading in an optical fiber due to ...
0
votes
0answers
23 views

Effects of Lens Changes on Geometric Optics [closed]

What is the effect of changing curvature of a lens on the location of the projected image?
0
votes
0answers
19 views

Determining the focal length of a gradient index lens

There are three subquestions in this question, all marked bold. Let's consider a planoconvex gradient index lens of thickness $d$, radius $R$ whose refractive index changes with the distance from ...
0
votes
1answer
25 views

Calculating the beating length of the directional coupler

I want to determine the coupling length needed to achieve a certain power coupling coefficient of a directional coupler. Recently, I read a paper titled "Ultra-compact high order ring resonator ...
0
votes
1answer
21 views

What's the difference between on-axis and peak intensity for a Gaussian beam?

I am asked to find the ratio of the on axis intensity at z=zR (Rayleigh range) to the peak intensity, given that the Gaussian beam solution is: ε(ρ,z) = ε0 (ω0 / ω) exp(ikρ^2 / 2R) exp(-ρ^2 / ω^2) ...
0
votes
0answers
14 views

What criterion did Abbe use?

For a microscope (correct me if I am wrong) the Rayleigh Criterion gives us: $$ R=\frac{1.22 \lambda}{NA_{condenser}+NA_{objective}}$$ But with the Abbe diffraction limit: $$ ...
0
votes
1answer
30 views

Diffraction in Circle of light? [duplicate]

I'm working on a project that refers to optics. the question says when a laser beam is aimed to a wire ( perpendicular to the surface ), a circle of light then will be seen on a the surface. I somehow ...
0
votes
0answers
39 views

Image formed by Refracting light

A jellyfish is floating in a water-filled aquarium 1.33 m behind a flat pane of glass 4.30 cm thick and having an index of refraction of 1.5. (The index of refraction of water is 1.33.) Where is ...
0
votes
1answer
22 views

Why does light reflected on water tends to 'smear' in the vertical direction? [duplicate]

I have noticed that in city lights reflected on the water are very often smeared more in the vertical direction (relative to the reflecting plane I presume), than in the horizontal direction. See, for ...
0
votes
1answer
18 views

Understanding Braggs x-ray diffraction and why light is treated as a single “ray/line”

I'm not familiar with optics. So my knowledge of treating light as single lines is almost completely foreign to me. Although I do know something about EM waves and Maxwells equations, so you can ...
0
votes
0answers
44 views

Far-sightedness problem

Let's consider BOB and HENA have far-sightedness problems, and they uses lenses to correct their vision. Somehow, they exchange their glasses; how then can we determine the closest object distance ...
0
votes
0answers
11 views

Scattering of strong non-resonant light by cesium vapor

can anybody provide good references (research papers, books,,reviews, recent...) about a VERY strong NON-resonant light scattering from a cesium atomic cloud/vapor? (The light should be capable of ...
0
votes
0answers
40 views

Why can one see the outline of a white sheet of paper kept on another white sheet of paper?

Why can you see the outline of an object of a color that is in front of another object of the same color.
0
votes
1answer
45 views

Is near point defined for a myopic eye and far point defined for a hypermetropic eye?

I learnt about far Point of a myopic eye and near point of a hypermetropic eye. But I am confused about the above question. And if near point is defined for a myopic eye and far point defined for a ...
0
votes
0answers
16 views

What is the transfer function in fft beam propagation for unpolarized light?

What is the transfer function in fft beam propagation for unpolarized light ? How to construct the fft beam propagation ? This is for homework. For coherent light the beam propagation is E(x,z) ...
0
votes
0answers
16 views

Why are certain opaque objects so biased?

Why is it that most of the opaque objects only block em waves in the visible spectrum but fail to block waves with frequency higher and(or) lower than the visible spectrum?
0
votes
0answers
18 views

Optics Network NEED good Reference or TEXT

I am using Optical Networks: A Practical Perspective, 3rd Edition (Amazon link) as a reference for studying optics network. The main focus of the course is rather on the layer, data, and protocol side ...
0
votes
0answers
42 views

Reflection and refraction of light [duplicate]

When a light ray strikes an interface a part of it gets reflected, a part of it gets absorbed while another part gets refracted. Why does light reflect? Why does it refract?