Questions tagged [reflection]

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1answer
195 views

Explanation for possible interference on a home mirror?

I've noticed that a few peculiar things about home commercial mirrors that aren't present with industrial/scientific mirrors. This is one of the mirrors I used. With the mirror like the one above, ...
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1answer
479 views

Under water light reflection of air in a cup vs water in a cup

The last time I was on vacation I was drinking on the swimming pool, and after I was finished with the drinks I started playing with the 2 plastic cups I had, and noticed that the air produces a ...
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37 views

Focusing of a cylindrical mirror in X-ray optics

Focusing cylindrical mirror are sometimes used to squeeze a photon beam in one direction. They can be vertically focusing or horizontally focusing, and such mirrors are typically used in X-Ray optics ...
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380 views

What are the limitations on the Paraxial Approximation?

What my physics book referred to as the paraxial approximation derived to be thus: $$\frac{1}{s}+\frac{1}{s'}=\frac{2}{R}$$ as a way of showing that in a concave spherical mirror, all reflected rays ...
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0answers
28 views

Total amount of diffusely reflected light off of a sphere?

I have a numerical simulation that uses ray tracing to calculate the total amount of light picked up by a sensor, after diffusely reflecting off of an object. To validate this simulation, I'd like to ...
2
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2answers
328 views

Explanation of formation of Newton's rings

I was asked to do a lab report in my University about Newton's rings experiment that we made in lab. I understand that the aim of the experiment is to measure the wavelength of a light after the ...
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2answers
54 views

Which Fresnel coefficients should be used at normal incidence?

There are two sets of Fresnel coefficients depending on the polarisation of the incident light. At normal incidence these equations converge except there is a phase factor of $\pm1$ For the reflection ...
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0answers
27 views

What are upper reflectivity bounds of materials

I know that if i take metal-coated fiber i can send light signals to large distance, because signal would reflect inside fiber, lowering attenuation. Just like in optical fiber communication network. ...
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0answers
454 views

Reflection of “phone screen” light in a window

I've noticed that the reflection of a phone (or computer) screen in a window (or other smooth surface) has distorted colors (towards red-purple or green-yellow), which change as the screen is rotated ...
2
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1answer
37 views

Perception of rainbows

Does the shape of a rainbow have anything to do with the concave shaped back of a raindrop, from which the light is reflected?
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0answers
32 views

Trying to prove, that an initial spatial and restricted displacement on an infinite string, with a density discontinuity, will transmit AND reflect

This is a rather trivia problem, but I have been trying to prove it, since all of the Books I have read - online or not - take it for granted. The problem I'm talking about is "Vibration of String" ...
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107 views

Is it possible the opposite of tunneling?

In tunneling we have particles of energies $E<V$ going through barriers of potential $V$. Can we get particles of energies $E>V$ get reflected by these barriers of smaller potentials?
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0answers
180 views

Standing spherical wave solution

Let's say we have a spherically symmetric light wave $u(r,t,\theta,\phi)= u(r,t)$ that satisfies the following wave equation with spherically symmetric potential $V(r)=2/r^2$ (also set $c= 1$ so $\...
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0answers
61 views

How does the reflectivity of a light-source change when it's switched on/off?

Q: How does the reflectivity of a light-source change when it is switched on/off? Consider a light-source like an red LED with some white light shining on it. When the LED's switched off, it's going ...
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727 views

Calculating reflection of light when the refractive index changes continuously

Suppose you have 2 materials, one with refractive index $n_1$ and the other with refractive index $n_2$, and a plane-wave coming from the first material hits the interface with an incident angle of $0^...
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276 views

Can partial reflection be explained?

QED can calculate The probability of partial reflection but does not offer an explanation as to how this happens. Feynman created an algorithm that matched the data. I have searched but cannot find ...
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1answer
2k views

What type of mirror is feasible for Schlieren photography setup?

I would like to build a Schlieren photography system with a single mirror setup*. My question is - what type of mirror (parabolic/spherical) is good or at least feasible for this setup? The theory ...
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0answers
175 views

Are there Optical Magnetic Mirrors (OMMs) which reflect via interaction with the magnetic field?

The most familiar mirror relies on reflection from a metal, where the very strong interaction of the electric field component of the EM wave with the conduction electrons produces a reflected wave. ...
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0answers
471 views

What happens to Newton's Third Law during the reflection of a pulse from a free end?

Well, it is known that a pulse gets inverted when it gets reflected from a fixed support while the polarity of the pulse remains same when the incident pulse gets reflected from a free end. However, ...
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51 views

statistical property of light reflected from a coarse mirror

This is a problem comes up in my study in correlation reflectometry. I'm wondering if there is a straight-forward way to interpret the phase and amplitude of the reflected light from a perturbed ...
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0answers
236 views

Maximum laser power that mirror can handle?

Can I use standard mirrors used for lasers used for laser shows to build some laser that has higher power and is able to burn materials? What are power and power density limitations that cannot be ...
2
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0answers
678 views

What happens when light is reflected from a surface moving in a medium with a huge refractive index?

Imagine a mirror is moving away from a light source in a substance through which the speed of light is very slow -- so slow that the speed of the mirror is close to being the same as the speed of the ...
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216 views

Bragg reflected electrons

Could you explain how does bragg reflection happen for electrons? What does it mean that when they satisfy Laue condition? This already is asked in Physics SE. They are Bragg reflected in the opposite ...
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0answers
180 views

Modeling a spray painted polyurethane surface reflection

I'm modeling light interaction/reflection from a fiberglass surface with polyurethane epoxy (that is very reflective) that has been spray painted with a matte black paint. I'm looking for some input -...
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31 views

Explaining phase shift from a half-silvered mirror

I am trying to understand why light undergoes a phase shift when reflecting off one side of a half-silvered mirror, but not the other side. This Wikipedia page and this answer both give the following ...
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0answers
16 views

Reflection coefficient phase using Kramers Kronig, formula equivalence

Why are the following two formulas for the phase of the reflection coefficient equivalent (according e.g. to [1])? \begin{align} \Theta(\omega_0) & = - \frac{\omega_0}{\pi}P\int_{0}^{\infty}\frac{...
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0answers
30 views

Acoustics in heterogeneous medium: Reflection and Tranmission

I am trying to understand the effect of changing impedance on acoustic pressure wave. I have attached the image from the book "Fundamentals of Acoustics"(Kinsler et. al)(r1 and r2 are the impedance of ...
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19 views

Polishing Spherical Refracting surface vs Lens

My text book states that When we polish a spherical refracting surface (sphere) it doesn't behave as spherical surface and mirror .It still behaves as spherical surface. The polished side is just ...
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0answers
24 views

How far will the imaging be? And is it possible to make it farther?

So currently I'm trying to make a smart glasses, where you have a projector that projects an image onto transparent flat glass, and some of the light will reflect into your eyes (something like the ...
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21 views

Individual air molecule momentum exchange

Background: Looking at this illustration about solar radiation pressure on a perfect reflective surface, incident photon exchanges its momentum to the slanted surface which provides a reaction force ...
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2answers
62 views

Why does the electric field and not the magnetic field remains in the same direction after reflection from a medium?

I was reading up about reflection and transmission when an electromagnetic wave is normally incident on a surface. I came across this figure : My question is why is the direction of electric field ...
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74 views

Why isn't there aberration in parabolic mirrors?

It is known that aberration happens in spherical mirrors due to the fact that all reflected lights doesn't pass through the focal point. But how would you prove this doesn't happen on parabolic ...
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1answer
38 views

Parabola black body heating

I'm having trouble figuring out why this following example of shenanigans wouldn't work. If you take a parabolic mirror (say from polished aluminium) with a magnification of M and construct it such ...
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1answer
45 views

Does Huygens Principle of reflection take polarization into account?

There are many applets on the internet which demonstrate Huygens Principle or reflection/refraction geometrically. This is one such example: https://www.olympus-lifescience.com/zh/microscope-resource/...
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23 views

Periodic waves traveling on an ideal flat sea and the reflection of the Sun

Suppose sinusoidal parallel waves (with equal wavelengths and amplitudes) are traveling in different directions on an ideally flat sea. The Sun is shining, let's say, $30^0$ above the horizon and the ...
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19 views

When should we draw Mirror Extension to show Line of Symmetry

In the attached image, the mirror extension is drawn to show the line of symmetry to solve this question. My doubt is that under which condition, we should draw the line of symmetry.
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1answer
33 views

Will a box with black or mirror lining have a higher temperature?

Imagine having two boxes side by side out in the sun. Both boxes have cardboard as the floor and side surfaces. The top surface of the box is a piece of glass to allow in heat and insulate it. Each ...
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2answers
34 views

Reflection of a mirror concerning angle and wavelength

Mirror has a silver coating which helps it reflect all colors of light. From my classical understanding, silver atoms reflect light by absorbing it and then emitting it at the same angle to the normal....
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73 views

Why doesn't Feynman take the real part of a complex EM wave before finding the intensity?

This is from The Feynman Lectures vol 2 chapter ch 33 on reflection of complex EM waves on metal. In the above I would expect $\frac{I_r}{I_i} = \frac{Re(E'_0)^2}{Re(E_0)^2}$, rather then $\frac{...
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2answers
151 views

Why do mirrors not follow brewster's angle?

Normally a material will have an angle where the reflected light is completely polarized. Now say we have a mirror (implemented by a conductive silver coating) that reflects most of it's incident ...
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0answers
131 views

Difference between Scattering and Reflection

I am confused: What exactly is the difference between optical scattering and optical reflection? To me, both terms are distinguished by where we place the observation plane. Reflection: Observation ...
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1answer
98 views

Does a reflection grating not follow the law of reflection?

The Law of Reflection states that the angle of reflection is equal to the angle of incidence. However, consider the case of a reflection grating with light incident at only one specific direction, ...
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2answers
143 views

In diffraction When wavelength is less than slit width then does the scattered light gets absorbed & emitted from the wall or just rebound?

I know that when the slit width is less than that of wavelength then the slit will act as a point source and scatter the light in all directions. But my question is that during the scattering of ...
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0answers
27 views

Analytical Solution: EM Scattering from Hemispherical Indentation in Plane

I have a problem of trying to calculate the losses that occur when a beam of light reflects from the surface of a partially transparent medium that has an open cavity. The circumference of the cavity ...
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0answers
39 views

working to understand virtual images

I'm starting to understand how to use lenses a bit more, but I'm still pretty lost. I'm building a project that's extremely similar to this one with the implementation. I think my biggest challenge ...
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1answer
75 views

Air gap in a radiant barrier insulation system: why?

It's generally accepted that a reflective surface, when used to insulate a system by reflecting radiant energy back to it, must have an air gap in front of it. Why exactly is this, and what determines ...
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1answer
80 views

Light reflection from a charged surface

Will we see differences (in intensity or spectrum) of visible light reflection from surface of positively versus negatively charged metal plate (or any non-conducting materials)? Are there data about ...
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1answer
267 views

Phase shift for reflection and transmission on absorptive medium with complex refractive index

I am trying to come with a hand-waving explanation as to why the reflection and transmission peaks of a metal-coated Fabry-Perot cavity are shifted in frequency (see the paper by Monzon & al). ...
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1answer
55 views

Neutron reflectivity/X-ray reflectivity vs critical angle

I am trying to write a code that calculates Neutron/X-ray reflectivity profile of a multilayered system using Parrat algorithm. I am wondering what to do for $Q$ values below the critical $Q$ edge (...
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1answer
33 views

How do you find the pole of an irregularly shaped spherical mirror?

I know that pole is the geometric centre of a spherical mirror. But how do you really find it for an irregularly cut mirror in real life?