Questions tagged [reflection]

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0answers
18 views

Parallel rays hitting a parabolic mirror at an angle

I was thinking about parallel rays hitting a mirror that has a parabolic horisontal cross-section and a linear (straight) vertical cross-section. I can't understand what would happen if the rays came ...
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1answer
33 views

Why do the LINES in a vertical soap bubble get thinner as we go down?

I understand that the soap bubble gets thicker at the bottom of the bubble due to gravity, resulting in a complicated array of different colors of different wavelengths being constructively and ...
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1answer
44 views

3D reflection of a ray on a cylindrical mirror

I am trying to calculate the reflection of a ray on a cylindrical mirror in a three-dimensional space. To achieve this, can I apply the laws of reflection separately in xy and xz planes (as in the ...
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1answer
28 views

Layer of material that transmits light in one direction and absorbs it in the other direction

I am looking for a material (or layer of materials) which transmits light coming from one side and absorbs light coming from the other side. The absorption should be as good as possible and the ...
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0answers
17 views

How to analyse dielectric discontinuity in Waveguide?

I came across this question the solution given was to use the formulae for reflection coefficient with characteristic impedance of wave guide replacing the ones in boundless medium. What I am ...
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1answer
55 views

Why does a rainbow only form with a 42° angle? [duplicate]

Why do rainbows only form with a 42° angle? Is there something special about this angle?
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2answers
31 views

Far sighted mirror reflection

I am far sighted. I need reading glasses to see clearly up to a distance of approximately 14 inches. Why, when I look in a mirror is the frame around the glass blurry but my face crystal clear?
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0answers
20 views

Can we study the effects of Quantum reflection on heavy atoms?

From what I've looked at, it feels like QR has only been studied on light atoms like He, Ne, Na, H, etc. But can we study this effect on heavy atoms like Rb-87. If not, is it because of the ...
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25 views

Why does a stationary mirror reflect different imagery depending on observer's angle?

I'm a scientifically uneducated buffoon with little schooling, who has just been reading about the simulation hypothesis and now can't work out something that should be straightforward. I'm lying on ...
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1answer
17 views

Do dieletric mirrors and other reflective surfaces have a maximum intensity to which the absoprtion coefficient increases?

That is, if you shine a laser at a dielectric mirror so that the intensity(photons/seconds*cm^2)becomes sufficiently large, the scattering of the photons off the electrons in the surface atoms becomes ...
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1answer
31 views

Boundary condition for partial reflection

I want to solve a wave equation for the wave $\psi(x,t)$. One boundary is moving, therefore I impose the velocity $$v(x=0)=v_a\cos(\omega t)$$ the other boundary is fixed, but reflecting. If the ...
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1answer
46 views

How do I explain the below phenomenon I am seeing along the edges of my eyeglass lenses?

I am near-sighted. Here is the phenomenon: I stand in front of a light source that is situated on the ceiling so that it reflects off my eyeglass lenses and appears circular. It is a white light ...
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1answer
25 views

Reflection and Transmission at oblique incidence Griffiths

I’m working through Griffiths E&M and on page 408 he gives the boundary conditions for oblique incidence. I’ve spent an hour trying to understand how he goes from the boundary condition $$\...
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1answer
44 views

Images created by a pair of perpendicular mirrors

Let's assume we're given a pair of perpendicular mirrors. Let us set a system of coordinates as shown on the picture - the position of an object is given by $(x_p, y_p)$. Of course we would observe ...
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2answers
66 views

Snell's law and Fermat's principle

I have read this sentence on a book about the Snell's law of refraction, referring on a ray that passes from air ($n_1=1$) to glass ($n_2=1.55$): "Snell's equation can be derived from Fermat's ...
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0answers
9 views

Which is the optical axis of fibres-in-host nanostructure material?

Suppose we have a nanostructred material composed of aligned (cylindrical) fibres embedded in a host, effectively forming a uniaxial crystal. Which would be the optical axis of this crystal, along ...
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14 views

How to incorporate refractive index in transfer matrix method

I need to determine the TE and TM reflections at the interface between a uniaxial crystal and air, using a matrix-based method, such as the TMM. I can do so using the Fresnel equation with ease, but ...
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3answers
66 views

Shooting a single photon at a 1/2 transparent 1/2 mirror 45 degree piece of glass [duplicate]

I have very limited knowledge of any of this (read: none), but have wondered this for a number of years: What would happen if one were to shoot a single photon at a piece of half transparent / half ...
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0answers
12 views

Why is the reflection of CFL bulb a green spot on my glasses

Why is that if i try to see the reflection of a CFL bulb (the bulb is on) using my glasses i see it as 2 green spots instead of a white light. plus this happens on the outerside of the lenses...not ...
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3answers
104 views

How do window blinds work?

How do window blinds help to reduce the temperature in a room? On the one hand, I know that drawing the blinds helps my room to stay cool in the summer. On the other hand, just as much sunlight is ...
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1answer
21 views

Can iridescence be produced with a monochromatic light source?

An iridescent substance appears to change color based upon the angle of observation, and I assume this is because the substance reflects different frequencies of light at different angles. My ...
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2answers
31 views

Angles of Refraction,Internal reflection and incidence

First ill ask my question in brief and then ill elaborate it below... Theoretically is it that internal reflection occurs within a solid sphere(which is considered to be the denser medium) if and ...
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1answer
61 views

What can be used to change the direction of the laser beam? [closed]

Let's say we have a laser beam coming from a source called X, we would like to change its direction so that it would hit directly on the object that we have. What would be the possible solutions?
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1answer
32 views

What is the best material to be detected by hearing-wave sonar?

I would like to find a material which could very noticeably reflect or absorb a sound wave frequency between 20Hz and 22kHz, preferably in a grassy or organic nature environment. Preferably this would ...
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0answers
21 views

Change rate of reflection vs. incident angle

It is known that the reflection on the surface could be determined by Fresnel equations. The reflection increases as the incident angle of light becomes bigger. When we look at the change rate of ...
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1answer
36 views

Image formation for concave mirror when object is at centre of curvature

Everywhere I see it is quoted that when an object is at C its reflected image by a concave mirror will also be at C (and be inverted and equal-sized), but when I draw it this is impossible, it always ...
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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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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 ...
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4answers
2k views

Reverse of diffraction

Can we arrange a practical in such a way that the dark and bright bands in diffraction grating be allowed to pass through the same slit to get the original light (i.e the incident light before ...
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0answers
22 views

Appearence of colors on heated ceramic surface

I've recently noted that whenever I put hot food or blow hot air on the plates I have home, the following colors appear on the slightly heated areas and disappear quickly as the plate cools down again....
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1answer
42 views

Why does the Complex Index of Refraction take part in the Reflection?

I'm aware that in Optics, the complex index-of-refraction $\eta = n+ik$ is used, which famously leads to the reflection property at an incident angle, i.e. Fresnel's law: $$R=\frac{(n-1)^2+k^2}{(n+1)^...
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16 views

Reflectance and transmittance equations for metal thin film

The Fresnel's equations no long work when the thickness of the metal thin film is thinner than skin depth. For example, the reflectance of a metal thin film is always the same according to fresnel's ...
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1answer
33 views

Color dispersion at the edge of a slanted mirror

When I look at the edge of a slanted mirror it looks like its affected by color dispersion which you can see by Image 1 but, when it reflects off the flat part of the mirror it looks normal, Image 2. ...
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1answer
2k views

Is the specular reflection on a polished gold sphere white or gold in colour?

My understanding is that all specular reflection is due to Fresnel reflection at the interface which is a broadband effect. A classic example might be a white reflection on a polished ball (e.g. ...
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2answers
31 views

Why texture of an object depends on the amount of light it reflects?

The darker an object, the less visible is it's texture: texture of blackboard is visible because it reflects 7% of light; texture of an asphalt road is visible because it reflects 4% of light; an ...
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1answer
34 views

Why thickness of metal thin film will affect reflectance?

The reflection of the interface of two layers is described by Fresnel's equations. For instance, the reflectance of an Al bulk at 1 micron is around 0.9, this is the reflectance of the interface ...
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1answer
61 views

The facts of travelling at the speed of light [duplicate]

I’m travelling at the speed of light. If I hold a mirror in front of me could I see my face?
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1answer
56 views

Acoustics: Reflection and Transmission Coefficients

While studying about reflections and transmission coefficient in a discontinuous Media I came across two definition of coefficients one which seems to be correct according to me as it is in accordance ...
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0answers
26 views

Destructive interference by a hard boundary

" Wavefronts on reflection off of a hard boundary ( rigid boundary ) have their phases inverted. " This is something I've learnt. " Waves with same amplitude and opposite phases destructively ...
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3answers
57 views

Why does an object immersed in water look less shiny than in air?

I was surprised to learn today that objects look less shiny when immersed in water. Presumably it's because of the different index of refraction of the transparent medium, but why? Source: https://...
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4answers
47 views

Why does light seem to reflect preferentially off surfaces and interfaces even when the stuff in question is non-opaque?

Glass is said to reflect about 4% of incident light. The other 96% is either absorbed or transmitted. That 4% seems to reflect from the surface of the glass. From the perspective of a 'stream of ...
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0answers
17 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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1answer
48 views

Relativity and Reflection

Suppose that you have a hollow pipe of some sort long enough to cover the distance between earth and another planet approximately 4000 light years away. The setup is done is such a way that a room is ...
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1answer
41 views

Can a system be engineered to cause a standing wave resonance with gravitational waves

Can a system be engineered to cause a standing wave resonance with gravitational waves? It appears that gravity waves can be reflected. Do Mirrors for Gravitational Waves Exist? Stephen J. Minter, ...
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5answers
234 views

2 windows - will I see the reflections?

I have a question regarding photons nature. Let's say I have a single source of light - regular bulb and the observer - in the same room. The observer looks through a glass window (normal glass ...
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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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1answer
90 views

Do clouds reflect radio waves?

Do clouds reflect radio waves? Specifically, those waves used in radars. And, what kind of matter refracts or reflects radio waves?
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2answers
53 views

How do lens capture reflections clearly?

In an optical system which uses lenses (cameras, our eye) multiple rays from the same point are conveyed in a single point on the retina / image sensor. This is typically shown as in the image below. ...
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1answer
29 views

“Partial” Total Internal Reflection

Can partial TIR happen? Consider the image present in this link Here, at point D, TIR happens, but also there is transmission. Is "total" internal reflection a misnomer?
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Calculating the reflection and solute permeability for a diffusion cell

Here is the question, at which I have some problem. 'The three characteristic parameters $\sigma$, $L_p$ and $\omega$ can be determined from two experiments; in the first experiment 4.6 ml of water ...