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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Refraction inside a refracting medium

After a light ray gets refracted at the boundary of a refracting medium, why do sent the light ray keep refracting inside. Cause if you divide the medium into many boundary layers then light should ...
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54 views

Lens combination

Suppose there are two lenses touching each other as shown in the diagram below. the focal length of the lenses are $f_1$ and $f_2$ respectively. Now by using the formula for lens combination I ...
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129 views

Why doesn't a Gaussian beam converge to a point?

No matter what lens is put in the beam path of a Gaussian beam, it will always go through a waist of non-zero width. Why not just a point? I know the maths, I'm wondering whether there is any ...
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2answers
71 views

Can lens designs be brute-force computed to create optically precise equipment? [closed]

It seems lens design hasn't changed much over the last 50 years or so with many older manual lenses still very much being used today. Can the order, distance between and type of lens elements be brute ...
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1answer
45 views

What are the right signs? [closed]

This is a question provided in my book: An object of height $2\ \mathrm{cm}$ is placed at a distance of $2.5f$ from a concave mirror where f is the focal length. Find the height of the image. ...
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23 views

Effect on frequency by refraction [duplicate]

During refraction, only wavelength changes, while the frequency does not. This reduces the speed. Can anyone explain why?
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2answers
52 views

Are these reflected rays really parallel?

I have read that if an object is placed on the focus of a concave mirror (assume that the object is a vertical line placed on the focus), then the image will be formed at infinity. Here’s a diagram. ...
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1answer
40 views

pinhole in projector screen

Consider a conventional slide projector projecting a properly focussed static image from a photographic slide onto a conventional screen, with a second screen placed a short distance behind that one. ...
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What is the maximum concentration ratio achieved for CPV (concentrated photovoltaic)? [closed]

CPV uses ratios in the range of 100-1000. On what lens parameters does it depend.
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13 views

What parameters decide the maximum concentration achieved by a fresnel lens?

Fresnel lens can be used for concentrating sunlight for Photovoltaic. What parameters of the lens decide the maximum concentration that can be achieved using the lens.
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63 views

Why is the electric component of a light field more important than the magnetic component? [duplicate]

This is the common impression. But, is it just a rule of thumb and correct only in some wavelength region or does it hold universally?
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72 views

How do you detect the colors of a traffic light? (exam question) [closed]

I just took an exam where the question was: give three ways you can detect the colors of a traffic light given only a gray scale camera. You're allowed to use any optical devices. We learned about ...
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1answer
36 views

Which gives the most realistic pictures, Mirror, camera or their combination?

By googling, I have found several different opinions about how to take one's own facial images more realistically: Some said photos taken by cameras (smartphone's cameras, if specific) are more ...
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Is it possible that a person with myopia will see a blurry picture as normal? [duplicate]

I am trying to process an image in good quality to appear blurred to a normal person and good to a person suffering from myopia as seen in this source. Is it possible that a picture that is blurry ...
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1answer
69 views

Bounced ray angle of normal direction? (SOLVED) [closed]

TL;DR whats the position of C. I'm currently programming something and for some reason I having problem figuring this one out, imagine having a ray / or ball bouncing (without mass or gravity etc) ...
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1answer
18 views

Stokes Polarimetric Measurements

In Stokes polarimetry, a method is presented in "The Handbook of Optics", Chp 22 by Chipman under light measuring polarimetry that presents a data reduction equation for finding the 4 Stokes ...
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104 views

Detailed form of light waves in vacuum and how to test it experimentally?

Consider a light wave in vacuum. Do the $\vec{B}$ and $\vec{E}$ fields have to be orthogonal to each other? Since you can add constants to a solution to Maxwell's equation it doesn't seem neccesary ...
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4answers
74 views

If a silver atom scatters light isotropically, what happens if only a single photon is scattered?

From this question :Why is the light reflected at the same angle from mirror? and this part of the answer: The starting point it that a single silver atom is far smaller than the wavelength of light, ...
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2answers
27 views

Polarized light in single mode fiber

In single mode fiber the light propagates in two orthogonal planes. Input will be linearly polarized light, which state of polarization will be on output and why? And if there will be some different ...
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1answer
26 views

Correcting Myopia with a Diverging Lens

My textbook says that a diverging lens works by rendering the object a virtual image at the myopic eye’s far point. However, wouldn’t the eye then perceive an object farther than its far point at the ...
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2answers
117 views

Is this wave spatially coherent?

Is the following wave (the solid lines representing the intensity maxima) spatially coherent? I've been seeing different, seemingly contradictory definitions of spatial coherence. Some places ...
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1answer
30 views

Quality High Intensity Laser for Interference Experiment

I am trying to do a variation on the double slit experiment in order to see how interference patterns change if the relative amounts of light passing through each slit change. I think I have the ...
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0answers
33 views

Difference between three mutually complementary methods: Raman, Infra-red spectroscopy and inelastic incoherent neutron spectroscopy?

When I read the wiki on Raman spectroscopy, I found a paragraph explaining what system is suitable for using Raman and what others do not. It provide two other method as shown in title: infrared ...
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1answer
40 views

Does 'focal length' mean something different with lenses and pinhole cameras?

Sometimes different but related things have the same name by some tradition or accident, causing a lot of headache to newcomers to a field. I would like to come to clear terms with this: does the ...
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1answer
41 views

Convex mirror cut in half

if I cut the convex mirror in half then how will the image be formed?? suppose I have a convex mirror and I cut it in half then how will the focal length of the mirror change?
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193 views

Rayleigh-Plateau instability and optic [closed]

Let a liquid jet fall onto a surface. If the contact point is illuminated by a lase beam, rings of light around the jet can be observed . (pic.1) and we know it that the reason of this phenomenon is ...
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2answers
114 views

Experiment to find the circle of least confusion (optics)

I want to conduct an experiment where the circle of least confusion (wiki ref) occurs for a lens. Suppose that I shine white light onto the lens and I know the lens EFL is lets say 100 mm, in order to ...
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1answer
46 views

100x magnifying optics system for short laser pulse

I am now designing an experiment that consists of a 400 nm short pulse (~300 fs). In the experiment, we need to magnify the transverse profile of the pulse by 100x. That's the problem. I was ...
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1answer
48 views

How to increase/decrease laser pattern size

I have a laser pointer with a diffraction grating lens that creates a cross-hair, like the one seen below. I'd like to be able to increase or decrease the size of the cross-hair so that it may ...
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3answers
43 views

How do you see a rainbow?

I know that we observe rainbows from light being reflected off of water in the atmosphere. So, what angle of incidence must exist between an observer and the sun in order to see the colors of the ...
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1answer
7 views

Third-order dispersion in glass, direction influence

I have learned that the third-order dispersion $\chi$ is a tensor with 81 elements. Nevertheless in glass one only has four elements, which either can be $x$ or $y$ (in this case). Now there exist ...
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0answers
20 views

a question of optical interference and it's energy propagation [duplicate]

When I am thinking about the interference of two laser beams, a curious question often comes to my head: Take a Mach-Zehnder interferometer as example and suppose the frequency of the leaser beams is ...
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31 views

Balance lens tilt aberration

Given a doublet (singlet in reference figure), if the rays enter at an angle with respect to the origin axis, we would see a shift of focal length for blue and red. A known optical jitter How could ...
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60 views

The Optics of the Vortex (in Water): why there is a bright ring also in reversed flow?

This question is closely related to this one; The optics of vortex (in water): why there is a bright ring? In this case "physics girl" gives somehow an plausible explanation, and it's only debatable ...
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34 views

What is the physical interpretation of Power Spectral Density (PSD) in optical tweezer?

For the calibration of an optical tweezer, the PSD of position values are plotted. If it follows a certain behavior having two regions - free diffusion and potential limited regions, then the trap is ...
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Btter using a cheap RGB or Monochrome-LCD as a mask for an incoherent white light source compared to?

To be precise, I'm trying to implement ans adaptive condenser-aperture in a brightfield microscope. It's remote and I don't want to have it mechanical moving all the time when changing the objective ...
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1answer
68 views

Combination of mirror and lenses [closed]

I am a keen learner of physics, but I am unable to solve problems involving lenses and mirrors together. please can anybody tell me the method to solve these problems? for instance let us take a ...
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0answers
48 views

How to compare optical fibers of different material, NA and diameter

For an experiment I would like to figure out how different optical fibers behave in terms of losses at both ends and their attenuation for a given wavelength. Let's say, I have three different ...
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4answers
107 views

Why shouldn't we shine laser light back into the laser?

After every laser there is an optical isolator that ensures the laser light cannot re-enter the laser, if reflected and sent back. What would actually happen if this were to happen? Would the laser ...
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2answers
58 views

What is the difference between scattering and backscattering?

I sometimes hear people talking about scattering and backscattering, but I really cannot distinguish between the two? Can some one please explain what is meant by these two concepts from a physical ...
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1answer
42 views

How does a DIY holographic display work?

I made a holographic display with this tutorial, but now I'm wondering if the 4 projections on each side of the pyramid do interfere with each other. Can you get just the same image if you only ...
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2answers
70 views

How to measure 8 μm surface bumps?

I want to measure surface bumps which are larger in size than $8\ \mathrm{\mu m}$ on a uncoated plastic mirror. So it can be any number of smaller bumps and that would not effect the application. I ...
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41 views

Will matter vibrating at THz frequencies emit light?

Much like a magnet creating an alternating current when slid through a solenoid, will matter that vibrates at 500 THz create lightwaves? Here we are talking about taking an object which doesn't glow ...
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52 views

What happens to the Fringe Width when the velocity of electrons passing through the slit in Young's Double Slit Experiment increases?

A beam of electron is used in Young's Double Slit Experiment. The slit width is d. Then the velocity of electron is increased. What happens to the Fringe Width? My approach: $$\beta = ...
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1answer
25 views

The Effect of Camera Lens Extension Rings on Minimum Object Distance [closed]

I found this article on hacking macro lenses. The author used a lens extension tube to increase the magnification of a standard lens into a macro lens. To my surprise the lens's Minimum Object ...
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1answer
37 views

Optics Diffraction Grating Plot

I was unsure whether to post this in physics stackexchange or mathematica stackexchange, so I posted it in both. I'm trying make an intensity plot for a diffraction grating that contains 100 ...
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2answers
93 views

Effect of polarizer on light's intensity

If you take unpolarized light and pass it through a polarizer, it's intensity will be half of what it was (ideally). Following Malus' Law I'd issume that if I pass this now polarized light through ...
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2answers
39 views

Let's suppose I am to display the letter R on mirror as well water , will I get the same images?

As far as my practical experience goes both look quiet the same when an image of any object is formed on them, yet I wanted to be ascertained is there any actual visible differences between both the ...
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32 views

Polarization Of Light From A Calculator Display

Okay so I couldn't see anything that matched this, partially because I do not know what aspect of polarization it fits into, but in Physics class we did a practical and as part of an extra bit of it ...
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Encoding multiple images in 1 beam

I am doing some research involving geometric optics. I need to reduce an image in size so it fits a rotating mirror we are using. I came up with the idea of projecting the focal plane on the mirror, ...