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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Why does a specific static image “move” when moving my head? (glass user)

I am a daily PC user. As most users, I have a taskbar (using Windows) that shows icons of programs. My two screens are big (24") and I'm at ~60cm distance from them, so fairly often I need to turn my ...
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11 views

When will an extraordinary wave refract at normal incdence?

Under what circumstance will an extraordinary wave refract at the surface of a (uniaxial) birefringent martial when at normal incidence? My educated guess would be that it refracts whenever the ...
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20 views

How could you add magnification to prism glasses?

http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=prism+glasses These are prism glasses I'm trying to devise a way to modify the them so that I can get magnification in ...
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22 views

How to determine the distance between the principal planes?

How to determine the distance between the principal planes ? If you know the lentgh of both focii, $\overline{FH}$, $\overline{F'H'}$ and additionally the distances $\overline{E1H}, ...
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54 views

Best collimation at focal point of lens?

From geometrical optics it is clear that we get the best collimation when the object lies at the focal point of the lens. I know that this carries over into cases where diffraction happens, but have ...
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33 views

Attenuation of light through a simple lens, and is it important?

I have an object with incident light rays traveling away from this object. Some of these rays are traveling from the left-hand side through a simple lens (say, a double-convex converging lens). As ...
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10 views

Can I simulate the motion of resonant scanner with a laser beam incidence and reflection using Comsol? Or I need to use different software?

I'd like to see the motion of the beam incidence onto a resonant scanner travels with 20 degrees wide. It is important to see the reflection inside a closed hollow geometry
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2answers
150 views

Michelson interfermetory point source types of fringes?

When we illuminate a Michelson interferometer with a point source with the mirrors at $0$ separation and with an angle between them, I have read we get linear fringes at infinity. Is it also true ...
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Why do beams of light (from torches or other directed sources) not extend to infinity?

When I'm in a dark environment, and I turn on a torch, I can see the beam of light from the torch. To the best of my understanding, the main reason why I can see the beam of light is that the light ...
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29 views

Focus correcting screen [closed]

With the rapid approach of VR, and being someone who's always needed glasses! I have been curious about this for a while. Is it possible to correct the focus of a lens by adjusting the image on a ...
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1answer
50 views

Is there an optical filter which exclusively passes right or left circularly polarized light?

Is there a circular analog to the linear polarizer filter, which can be configured to pass only right (left) and block left (right) circularly polarized light?
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68 views

Perspective Redux (why objects seem smaller as the distance increases) [duplicate]

Last time I brought this up, the best answer featured an image that looked something like this: The argument here is that as the distance increases between the eye and the object, the angle gets ...
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3answers
234 views

How to measure an image's contrast?

I'm studying Fourier optics and Interferometry and I intend to determine the contrast of an image using computer software. My teacher of Experimental Physics didn't tell me how to do it, and so, I'm ...
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1answer
28 views

How does magnification work in lensless optical setups?

In my optics classes, I have only ever seen magnification defined in conjunction with the thin lens equation. However, in a lensless optical setup such as lensfree in-line holography, how does one ...
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110 views

Jones matrices of a mystery device

When considering a Jones matrix $$J=\ \left( \begin{array}{ccc} \cos\phi & -\sin\phi \\ \sin\phi & \cos\phi \\ \end{array} \right) $$ I understand that the effect of a device described by ...
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25 views

Birefringence not caused by polarization?

Is there any other way for a material to be birefringent apart from it causing double refraction based on polarization? I.e. can a material cause double refraction in a way that does not depend on the ...
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26 views

Amplitude-Modulated Wave in a Dispersive Medium

Amplitude-Modulated Wave in a Dispersive Medium. An amplitude-modulated wave with complex wavefunction $a(t)=[1+m\cos(2\pi f_st)\exp(j2\pi\nu_0t)$ at $z=0$, where $f_s\ll\nu_0$, travels a distance ...
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23 views

Help understanding the wave number in light

For my final optics project I want to implement the beam propagation method using Fourier transforms. I came across the following document ...
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3answers
72 views

If energy of a wave is proportional to frequency, why are higher-powered lightbulbs brighter?

E = hf. Got it. P = dE/dt, right? Not seeing an amplitude anywhere in the formula, so shouldn't the power rating on the lightbulb only be driven by the color? Is it a problem with the way the ...
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50 views

Classical wave equation - validity

I know that classical wave equation carries for spherical wave fronts. In addition, Huygens' principle states that any wave front is a superposition of many spherical wavelets, so why does the ...
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25 views

Connection between coherence and monochromaticity of a light source?

Is there any connection between the coherence ( length, time ) and monochromaticity of a light source?
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20 views

Slit width of a diffraction grating monochromator?

I am trying to find an equation for the bandpass of a diffraction grating monochromatic. I have found this source (link to google books) which indicates that it is given by: $$sD^{-1}$$ Where $s$ is ...
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25 views

How lens for specs are manufactured for a given power? Do thickness, refractive index play role? [closed]

I read some where that if the prescribed glass power is more, glass must be made of higher refractive index to lessen the thickness. But from knowledge of physics, power just depends on focal ...
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1answer
53 views

Can you concencrate paralel laser beams?

I've seen some videos of laser toys but they all seem to use either one laser or lens with some specific range of focus. What I was thinking is this: But it seems like it might violate the 2nd law ...
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1answer
28 views

Why does looking through an LCD panel make things blurry?

When you take the back off an LCD panel and remove the backlight, you are left with a translucent panel. But when I look through the panel, even in its "clear" state, objects look blurry. Why is this? ...
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78 views

Why do electromagnetic waves diffract? [duplicate]

The expansion of electromagnetic waves due to diffraction can be easily explained with Huygens' principle (and in introductory courses this is usually how it is explained). But Huygens' principle is ...
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1answer
33 views

Holography, what is difference in it and photography in detail and in concern with physical meaning? [closed]

I don't understand what new will we get by it, mean I know it will get phase difference and features like that but physically what will we get? And it's reconstruction of image method?
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66 views

Please explain this optical phenomenon, as seen from the top of the cup [closed]

So here is a cup, and i poured some water in it. The question is why do i see those multiple reflections? What causes these images?
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2answers
49 views

Can decoherence occur just by simple reflection?

I create an entangled photon pair. One photon is sent inside a resonant cavity which reflects the photon many number of times. Will there be decoherence between photon in the resonant cavity and its ...
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2answers
93 views

Why is this laser beam being scattered(and not)?

I was shining a laser beam through a liquid filled test tube(an ester particularly),and I found this phenomenon rather intriguing.Have a look. Now when I passed the laser straight through the ...
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1answer
63 views

What is this optical phenomenon, as looked from outer space? [duplicate]

I just saw a photo from NASA. This is it. This is beautiful. But i am not being able to understand, what are those red and green lines above the earth surface? These cannot be due to Rayleigh ...
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2answers
74 views

What is exactly an ‘virtual object’ ? ( From the point of view of lens maker’s formula )

Here’s an image from my textbook It shows, how an image is obtained from a convex lens. The second and the third images, shows in depth , that how a convex lens behaves. They say, that suppose ...
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23 views

Why should the ray become parallel to base in a triangular prism at minimum deviation?

In the case of minimum deviation, the refracting angles at two surfaces are equal. Then the ray inside the prism should be parallel to the base only if it is isosceles triangular prism. But everywhere ...
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3answers
135 views

Rayleigh equation as explanation for sky being blue

I've been reading up on the internet as to why the sky is blue. The answer usually cites Rayleigh scattering that I've checked on wikipedia: https://en.wikipedia.org/wiki/Rayleigh_scattering: $$ ...
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23 views

Do silver or gold nano-partcles possess fluorescence?

my question is not only about silver or gold but any other metal nano-particles. Anyway, I'm personally interested in silver. So why do the tiny clusters (several atoms) of silver and gold possess ...
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31 views

Using Fraunhofer diffraction when projecting on a curved screen

Suppose I have a slit very far away from a curved screen (suppose part of a circle). If the screen was flat, the far field approximation is due to the Fraunhofer diffraction, and is given by $$ ...
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27 views

Using Huygen's principle to draw diagram of wave propagation within uniaxial crystal?

"A beam of unpolarised plane wave is incident normal to the surface of a slab of the crystal, with optics axis 45 degrees to the surface. Based on Huygens’ principle, draw the beams propagating in the ...
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1answer
39 views

“Classical” Coherence

I'm having a couple of courses where the concept of coherence is quite important. I know the traditional definition of coherence and it's connection to the phase of a wave. But often, I found, that ...
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64 views

Laser shone at liquid jet

When a liquid jet of water falls in laminar flow, it hits a surface. If this contact point, between the surface and the jet, is illuminated by a laser. Rings of light can be seen forming around the ...
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34 views

Optical Frequency Divider?

Is there an optical frequency divider that works to make 1064nm light from 532nm light? The opposite of KDP crystals?
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24 views

What is the meaning of size of the image?

Say I am standing at a distance of $20m$ from a plane mirror and looking at it. My image in it as I see it is smaller than how I perceive myself. Why then does my physics textbook tell me that in a ...
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37 views

Size of Fiber Optic? [closed]

I would like to know that why the size of fiber optic is important? What will happen if the size of the fiber optic is made large or small? EDIT: My question is simple. We all know that fiber optics ...
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2answers
54 views

Why are optical parametric oscillator so big?

Optical parametric oscillators have an optical resonant cavity. Why is this cavity so big when the wavelength of light is so small? What will happen if optical cavity length is shortened?
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52 views

Is it possible to save the light?

I am just thinking why can't we save the light (not a bulb). Lights normally get reflect by mirror, when source is off reflection is gone or absorbed or discharged by other object in room. Can't we ...
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1answer
38 views

Blue hues in Aluminum mirror

[][] When depositing Aluminium sometimes I end up with a bluish hue to my film especially when changing angle of view. I use a very high rate of deposition and low temperature. What would cause this?
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1answer
35 views

N-Body Simulation for Photons

For my undergrad optics class I am taking we have to select final projects to work on for second half of the semester. I have spent the last few weeks working on my own project which was a GPU ...
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1answer
43 views

How can one tell how much light is blocked by a secondary mirror in a reflecting telescope?

I've been reading about reflecting telescopes and I understand how the secondary mirror doesn't cause any obstruction to the image itself, but I've read that it does dim the image by blocking the ...
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3answers
59 views

Do white light generated by light bulb also have significant Infrared intensity?

I am planning to obtain near infrared light for a project. Instead of producing the infrared myself, I thought it might be easier to use something inexpensive and commercially available. That's why I ...
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1answer
10 views

What equation should I use to determine retinal image size generated by 10 micron DIA input beam?

If I plot the effective focal spot diameter (S) achieved by using the popular expression: S = (4L/pi)(F/D), where L is input beam wavelength, F is the focal length of the lens, and D is the input ...
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2answers
842 views

How does making “pyramid hologram projectors using smartphones” work?

The basis of this question is this video, where a 3D hologram like effect is achieved using a 4 sided hollow pyramid. I don't know if this is holography in the usual sense. Can some one explain this ...