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.

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Terminology - optical (visual) properties of a structure

I am trying to understand few terminological problems that I encounter. Without knowing keywords it is hard to perform search for literature or publications in the area. The area relates to the ...
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1answer
31 views

Why does this illumination pattern of an LED light going through a small pinhole not emulate the point spread function?

I have an optical setup where a component LED passes through a 50 um pinhole, and creates an illumination pattern on an image sensor approximately 5 cm away that looks like the following: Now, I'm ...
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1answer
45 views

Is it possible to get a lasing from every luminescent media?

Let's assume that there is a cavity with a couple of mirrors and gain media between which possesses luminescence under some external excitation/pumping. Let the absolute quantum yield of the gain ...
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1answer
70 views

What happens to photons, electrons, etc [duplicate]

What happens to photons when they hit our eye? where do they end up? if they generate heat, why our eye don't get overheated? Similarly what happens to electrons when the light hits certain metals, ...
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3answers
75 views

Is Huygens-Fresnel principle applicable for waves other than light?

In Wikipedia it was mentioned Luminous disturbance so I Did get confused that this principle only works for light waves and not for all of the Waves. Like some mechanical waves example wave on string. ...
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2answers
63 views

reflection of light on surface of solid

In a Scientific American article from 1968 in which he explains classically how light interacts with matter, Victor Weisskopf states that "the reflection of light on the surface of a solid or liquid ...
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45 views

Pair of Mirrors Facing Each Other [duplicate]

If you have two mirrors facing each other and you introduce a light source into the reflections and you take the light source away, would it immediately go away for all reflections in the "tunnel" of ...
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1answer
44 views

Reflection of light on semi-infinite solid

The following statement is often made concerning reflection on glass: "When light is normally incident on a glass surface, about 4% gets reflected and the rest is transmitted. The reflected wave is ...
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4answers
113 views

Is the Air Blue? [duplicate]

Randall Monroe, a credible source in my opinion, says that the sky is blue because the air is: Normal light interacts with the atmosphere through Rayleigh scattering. You may have heard of ...
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1answer
42 views

How to perform a rotation of field of view using only mirrors/lenses?

How does one rotate a "microscope" fluorescence image on the detector using only lenses and mirrors in the set-up shown above? I am trying to do ray tracing to understand how to do this, but lenses ...
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1answer
29 views

Given a light diffracting through an aperture of radius r, how would we find the radius of the beam at a position x meters away?

If we have a light source, say a laser or LED, diffracting through a circular aperture of radius $r$, how would we find the radius of the beam at a position $x$ meters from the optical axis? I ...
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1answer
72 views

Why do we see just one octave of light? [closed]

When one takes a look at the usual chart of EM spectrum one cannot help but notice that visible spectrum is slightly below one octave of frequencies; that is, the ratio between the highest and least ...
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18 views

Special case of mirror formula [closed]

Can anyone show me how to prove the mirror formula when the object is between focus and pole in a concave mirror
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29 views

3D glasses: how do we tell whether a doubly-rendered image is closer or farther than the screen?

This is a followup to this question: 3D glasses giving the opposite effect to that expected The current top answer explains that objects perceived as beyond the plane of the screen, as well as object ...
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4answers
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3D glasses giving the opposite effect to that expected

I have just finished watching the new Star Wars movie (The Force Awakens), and during the end credits, text is shown upon a background of stars. Wearing the 3D glasses, I noticed that the text appears ...
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0answers
35 views

3D hologram without a requirement of screen [closed]

How can I project a 3D hologram outdoor without a screen? is it possible to do it? Basically I just want a hologram of a square shape or a cube in a field at daylight.
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36 views

Which Method for finding velocity of an object in the mirror is correct? [closed]

My Professor asked a question, "A person is seen jogging in a rear view mirror of focal length $1$m. He is at a distance $39$m from the mirror. His jogging speed is given to be $5 \frac{m}{s}$. ...
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1answer
35 views

Michelson interferometer

I'm reading about an experiment done with this piece of equipment. The aim is to measure the thickness of a piece of plastic. They use white light, so the central fringe in the interference pattern, ...
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25 views

What are ways to measure light scattering for a science fair project? And how exactly does scattering work?

How does scattering work? And why? I am still in middle school. I am doing my science fair project on scattering and so far the resources I found have either oversimplified it or made it in a way ...
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2answers
93 views

Would a mass of bare iron nuclei be visible ?

As I understand it most of how objects look is because of how photons interact with electrons and photons emitted when excited electrons fall to lower energy levels producing photons. So if one traps ...
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1answer
50 views

How to determine the radius of curvature of a convex lens?

Suppose there is an equi-convex lens made of glass which has a focal length ($f$) of 30cm. Then, can we not say that the radius of curvature, $R$ of the lens is twice the focal length, i.e. $R = ...
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1answer
46 views

Stacking lenses for higher magnification (a DIY microscope)

Recently, I have made a DIY microscope stand for my phone according to these specifications. I am using a lens that I found in home, the closest match that I could find is here. I got some great ...
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4answers
35 views

What is the distinction between a “ray” and a “wave” in optics?

What is the distinction between a ray and a wave in optics? From what I can gather, the only discernible difference is in nomenclature, where a ray simply refers to an EM wave with short wavelengths. ...
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13 views

The image of an object through a curved surface

We have a curved surface, separating two different medium, with refractive index n1 and n2. We know the radius R of the curve,then how can we find the position v of the image? I read that the ...
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22 views

The sign of a focal length

We know that for converging lens, $f>0$ , for diverging lens, $f<0$. But for many materials I have read so far, it says that: "the focal length of a concave lens is 8 cm." I thought that the ...
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20 views

Coupling into FC/APC fiber

I am currently attempting to couple a 405nm laser diode into FC/APC fibre. The fibre is mounted on a flexure stage approximately 15.3mm from an f=15.29mm lens. I have managed to couple into the core ...
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1answer
30 views

Wave equation for spatially incoherent light beam

I would like to know what happens to a plane wave from a laser $$\Psi(r)=e^{ikr}$$ after it passes a ground glass. Would I just get a superposition of spherical waves? $$\Psi(r) = ...
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2answers
69 views

Speed and multiple images

Why an object (or something else) create multiple images of itself when it is moving fast? An earphone spinning in circle for example.
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6answers
5k views

Do people wearing glasses have different field of view than those who don't?

There is one thing I sometimes wonder about ever since I was a child. Do people who wear eye glasses see objects in different size than those who don't?(Technically different size means different ...
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1answer
25 views

Resources on solid state laser resonator design and modelling

I'm an experimentally oriented physics student and have been fascinated by lasers for a longer time. I'm currently building a diode-pumped, frequency-doubled Nd:YVO4 laser from scratch. Before I start ...
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1answer
40 views

how can interference occur within diffraction?

My book says : The number of interference fringes occuring in the broad diffraction peak depends on the ratio d/a that is the ratio of the distance between the two slits to the width of a slit. In ...
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29 views

Given a focal length and an aperture of the telescope, what is its field of view?

While I know FOV of scope is equal to FOV of eyepiece divided by magnification. How can one find FOV given only the focal length and aperture of the telescope?
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13 views

How to sketch transmission of ht eMZI in frequency domain?

I enrolled in to Optics&Electronics class and this is my homework: There are 5 questions and they were understandable and familiar(Teached in class) but question 3 is something else! I am not ...
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32 views

Is there sound diffraction grating? [closed]

Sound is also a wave phenomenon. Therefore, is there any counterpart of the usual optical grating for sound?
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1answer
32 views

Polarization in high energy vacuum non-linearity?

I heard that the vacuum becomes nonlinear at high energies. What is an intuitive explanation as to why this happens? For example, in classical optics non-linearitiy comes from material field ...
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How do phonon modes and other collective atom processes fit in with the Clausius-Mossotti relation?

The Clausius-Mossotti Relation relates the molecular polarizability of a chemical (that is, how much an electric field polarizes the molecule) to its dielectric constant, which determines its optical ...
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41 views

Rings of light around a jet [duplicate]

When an obstacle is put in the path of a liquid jet, some standing waves are created upstream of the obstacle (see the pic) or we can say a similar form like this for them ( the wavelength of ...
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1answer
52 views

What will happen in this LASER setup?

If I have 3 rectangular mirrors, say of dimensions length of 1 meter and width of 0.5 meter and I arrange them in the form of an equilateral triangle, which is of side 0.5 meter.(The mirrors are ...
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1answer
49 views

Is it possible to view an atom? [duplicate]

Is it possible to view an atom? What would it look like? Would it resemble a traditional atomic diagram?
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15 views

Stark broadening and Voigt fitting

I have LIBS spectral data acquired with a CT spectrometer of resolution 0.4nm. I fitted the Voigt profile into the spectral peak at $\lambda_0$. The lorentz $\Delta \lambda_L$ and the gaussian ...
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1answer
44 views

The confusion of fractional error calculation

I need to find the focal length of a lens by using equation 1/u + 1/v=1/f I have: u= 50+-3 mm v= 200+-5 mm I calculate the value of f as 40mm. Now i need to find the uncertainty in this value. ...
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2answers
35 views

Why is fiber coupling efficiency dependent on core diameter?

I read on Thorlabs' website that the coupling efficiency of a fiber is primarily dependent on the core diameter and numerical aperture of the fiber. It makes sense to me that if the beam of light ...
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1answer
54 views

Why does the wavelength gets shorter in the denser medium in refraction? [duplicate]

In the refraction, the wavelength gets shorter if it enters denser medium. Why is that happening? Is it just a phenomenon?
3
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1answer
92 views

How do hotel peepholes only work in one direction?

Basically the title. Light can go into my room through some lenses so that I can see it, but light can't escape my room so that people outside? The article about peepholes on Wikipedia doesn't ...
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36 views

Plane wave interaction with dielectric slab

Can anyone help me with this classical EM / optics problem? A plane wave is incident on a rectangular slab of a dielectric material. What is the form of the field in the region beyond the slab? ...
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17 views

Prismatic shaped rear view mirrors

To reduce the intensity of the incident light, prismatically shaped rear view mirrors are used in cars with a day-night switch which changes the angle such that instead of the polished surface ...
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0answers
38 views

Confusion with Fermat’s principle of least time [closed]

Here is an illustration used in my book to prove format’s principle of least time. My book says that ACB will be the shortest path. It is obvious that light reaches E first, and then X. If the ...
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2answers
44 views

What is the mechanism of the semi-transparent glass? [duplicate]

There are some one-way transparent glasses. Light can pass the glass in this way, but cannot in the other way around. It is quite contrary to the experience that the path of light is reversible. ...
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38 views

How to detect transient X-ray?

I have a Mercury UV lamp (ENF-260C/FE) which is supposed to emitte UV light with wavelength of 254nm and 365nm (http://www.chescientific.com/ecat/Eng/spectroline.pdf). However it is found that during ...
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Is the primary and secondary focal length of a lens always same distance away from pole of a lens? [duplicate]

Is the primary and secondary focus of a lens always same distance away from pole of a lens?Why? I looked up the net and could not find any satisfactory answer...