Questions tagged [reflection]

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Given $\theta_1$ (angle of incidence) and $\alpha_1$ (azimuth angl). how do we obtain the second reflection angle theta3 and alpha3? [closed]

Assuming the surface to be a mirror reflection(theta1 = theta2). Need an equation when varied the incident angles we would obtain the second reflection angles or a method to do so. please view the ...
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3answers
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Reflection coefficient as a function of frequency

I am trying to relate the equation for reflection coefficient in oblique mediums to the frequency but can't figure out how the frequency affects the reflection of light. $n_1$= intrinsic impedance of ...
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1answer
240 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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2answers
672 views

Radio wave behaviour in reflection, Refraction and Diffraction

I am trying to understand how radio waves behave when reflected, refracted and diffracted. I have put together a list based on light which I think will be the same. Can anyone tell me the behaviour of ...
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2answers
207 views

Why does concave mirror simultaneously form two images?

In an experiment to find focal length of a concave mirror, first we had to estimate its rough focal length. I kept an object at point which was beyond the focus in front of the mirror and got its real ...
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Motion of mirrors and speed of the image [closed]

An object is moving towards a plane mirror with a speed of 5cm/s.If mirrors is moving away from the object at the speed of 2cm/s then speed of image with respect to an object will be
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1answer
28 views

Refraction or reflection in dermoscopy?

I was reading a dermoscopy textbook, and I came across the following statement: Why do most moles just look brown? The stratum corneum reflects light, reducing the ability to see detail of ...
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Why are mirror images flipped horizontally but not vertically?

Why is it that when you look in the mirror left and right directions appear flipped, but not the up and down?
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1answer
54 views

What is the white spot in the sky in this phone-camera photograph?

Consider the image below, taken with a phone camera. There is a white spot near to the Sun, which is dependent on the orientation of the phone. I know it is not a planet nor some sort of star but it ...
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2answers
52 views

Do neutrinos not interact with any kind of photons?

If billions of neutrinos reach us from the Sun why there is no any reflection of photons emitted from Earth to be reflected from them? Is this they are not interacting at all?
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264 views

Why doesn't sound wave cancel out waves of same frequency after reflecting from the ear

We just finished our sound waves class at my university. I was taught that reflection of sound waves from an elastic boundary is accompanied by a phase change of $\pi$ while that from a rigid boundary ...
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1answer
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Are reflectance $R$ and $T$ transmittance independent of the direction in which the light travels?

If we have two different optical mediums $1$ and $2$, and we know the reflectance and transmittance when the light gets to the interface from the first one to the second, $R_{1 \rightarrow 2}$ and $T_{...
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1answer
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Deflecting bullet on water: Aiming on the reflection of the bull's eye to hit it? [closed]

My physics lecturer told the story about a lake in the Alps, which the locals use as shooting range. The shooting target is on the one side of the lake, the huntsman are on the other side. Because of ...
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2answers
33 views

Where does the virtual image actually form in a plane mirror?

I know this seems very basic. I was watching a video on reflection by plane mirrors and the teacher said that the formation of image happens inside the mirror and not on the backside. But, suppose I ...
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3answers
1k views

Why does reflection from a denser medium cause a phase difference of $\pi$?

I was going through a portion speaking about interference due to thin films. It says that a phase difference of pi occurs in the reflected system, due to reflection from the surface of a denser medium ...
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Reflectivity with complex refraction indices

So the general equation for the reflectivity at the interface between two materials is given by: $$R=\left(\frac{n_1-n_2}{n_1+n_2}\right)^2$$ in case of air/glass $n$ is real, but for, say, ...
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1answer
198 views

Sign Conventions in Mirror/Lens formula

All textbooks I've come across have the same way of proving the mirror formula. Everything makes sense, except the fact that they apply the sign convention once to obtain the mirror/lens formula, but ...
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1answer
34 views

Why the trees in water's reflection are looking smaller?

Why do the trees in the image which are above the oval shape are below the oval shape in the water, Is that something to do with the perspective? PC: Martin Damboldt ( Pexels )
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1answer
24 views

Other orientations besides s and p polarization for reflection

When talking about reflection of polarized light, one comes immediately back to Fresnel equations and Brewsters Angle. There, s and p polarization are defined as being perpendicular and parallel to ...
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50 views

Why do mirrors reflect light while regular surfaces don't?

i understand about reflection and how we see light but what confuses me is; all objects that can be seen reflect light (besides black obviously) and mirrors also reflect light. so why does one produce ...
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2answers
95 views

What will be the effect on the image formed by a mirascope if spherical mirrors are used instead of parabolic mirrors?

I was learning about the physics behind "mirascopes" from a number of online resources. It's explained that a mirascope consist of two concave parabolic mirrors of equal focal length placed on top of ...
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2answers
85 views

Which of the following phenomena are responsible for rainbows?

Which of the following phenomena of light are responsible for the formation of a rainbow? 1) reflection, refraction, dispersion 2) refraction, dispersion, total internal reflection 3) ...
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1answer
116 views

Partial single photon reflection

If I understood Feynman correctly, a single photon reflects with a chance determined by the added amplitude arrows of each surface it encounters. I'd still like to know how that is determined if the ...
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1answer
60 views

Are our eyes able to intercept the reflected lased visible photons(not the beam)if the degree of incident isn't 90°(or close)to the projected surface?

I think when we shine a laser through a vacuum, we should not see the laser beam until it hit the material containing the the vacuum. We can see visible-region lased photons as a beam of light ...
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2answers
42 views

Echoes and Pitch Change

I encountered something strange regarding echoes and pitch. One Fourth of July , I saw rockets reach a height its hard for me to gauge. I'd call it two to three dozen meters. I had noticed that ...
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3answers
276 views

Is real image formed by a single optical element always inverted and virtual image always erect?

Question: Is real image always inverted and virtual image always erect with respect to the object? Is there any single optical device (a mirror, or a lens, or anything else) which could produce a ...
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22 views

Three reflections in double-glazed window

If I have a phone with a single cable attached to it: Then why, when I look into double-glazed window, I do clearly see three reflections of this cable: (the above image's quality is terrible due to ...
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1answer
61 views

Creating a mirror reflection that appears to move faster than light

In the wikipedia article about tachyons, there is a visualization of what would see if such a particle exists and can interact with light and become visible. https://en.m.wikipedia.org/wiki/Tachyon ...
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36 views

With this lens and mirror combination, should there be a third image formed?

With this lens and mirror combination, should the lens form a third image after the second image got reflected by the mirror as shown below? I saw a Youtube video answering the same problem, yet i'm ...
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1answer
545 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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3answers
118 views

Reflections of light that reach our eyes

$S$ is a light source, $E$ is the eye of an spectator. There are two points $A$ and $B$ on a plane. Since incident angle and reflection angle is equal for all cases, how can the light reflected from ...
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1answer
38 views

Overcoming the critical angle of total internal reflection? [closed]

Incident light on an interface between an optically denser medium (refractive index $n_1$) and a less dense medium ($n_2$) will undergo total internal reflection (TIR) if the angle of incidence (AOI) ...
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1answer
95 views

Image Formation by a Spherical Mirror: angle change from $-\theta_2$ to $\theta_2$?

I am currently studying the textbook Fundamentals of Photonics, Third Edition, by Saleh and Teich. In a section titled Paraxial Rays Reflected from Spherical Mirrors, the authors derive the mirror ...
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1answer
202 views

Cube Beam Splitter Ratios in Reverse

Good day to all, I the following diagram is a non-polarized beam splitter cube with a 10:90 (R:T) split ratio. The questions I have are: that when light comes back does the 90°, R path still have a ...
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Why is reflected light polarised?

Why is reflected light polarised? I have learnt about Brewster's angle, and how at a particular angle all light reflected is polarised, but do not understand why. Is this something that could be ...
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0answers
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Relation between energy, frequency and wavelength [duplicate]

Frequency $f$ and wavelength $\lambda$ of light don't alter after reflection. If that is the case, then energy should also not alter after reflection as $E=h f$. But energy gets altered after ...
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1answer
436 views

Is it possible to have a virtual image and real image at the same time using a concave mirror?

In the picture below I have a object at half the focus length. I know that the image will create a virtual image. However I was wondering if it was possible to create a real image as well like I have ...
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3answers
53 views

About the foci of concave spherical mirrors

I am a high school student trying to learn spherical mirrors, and I’ve been told that the focal point is the equidistant point between the center and the surface of the sphere. I played around with ...
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1answer
255 views

What is the relation between reflectance and intensity?

I am just reviewing Fresnel's equations where Reflectance $R$ is equal to $$R=|r|^2$$ where $r$ is the complex reflection coefficient. Is there an equation that relates $R$ to intensity or is there ...
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1answer
2k views

Why do the sides of my fish aquarium look like mirrors?

I bought a new fish aquarium which is square/cuboid in shape. My previous aquarium was spherical in shape. When I filled it with water and put the fish in two of them started acting very stressed so I ...
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2answers
47 views

Number of reflecting surfaces in the rotating mirror in the Michelson method of determination of speed of light

The following text is from Concepts of Physics by Dr. H.C.Verma, from the chapter "Speed of Light", page 447, topic "Michelson Method": For higher image resolution click here. Michelson ...
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1answer
452 views

Why light rays gets scattered when it enters a translucent window pane?

Consider the light source is the light post, outside the window of my house (Pic 1). When the rays from the light post enters through the window pane which is translucent gets scattered and forms a ...
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28 views

Magnify a mirror reflection using a magnifying lens

Is it possible to magnify the image reflected from a mirror using a magnifying glass? Like if the mirror is inclined 45 degrees in respect to the beholder, and the lens is placed in front of the ...
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1answer
46 views

Advantage of using a polygonal mirror with larger number of faces in Michelson method of measuring the speed of light and its value

The following image is from Concepts of Physics by Dr. H.C.Verma, from the chapter "Speed of Light", page 447, topic "Michelson Method": For higher image resolution click here. The following ...
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1answer
46 views

mirror symmetry of spin-1/2 wavefunction: Definition of the reflection operator

I would expect from a reflection operator $\hat{M}$ to leave a wavefunction unchanged if two times applied, thus $\hat{M}^2=1$. However, for a spin-1/2 particle this is not the case when following the ...
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How does the use of concave mirror over plane mirror advantageous in the Fizeau method of determination of speed of light?

The following text is from Concepts of Physics by Dr. H.C.Verma, from the chapter "Speed of Light", page 445, topic "Fizeau Method": One can use a concave mirror in place of the plane mirror [...
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1answer
325 views

Mutilple beam reflection question in Fabry-Perot cavity

Just having some trouble with a question about Fabry-Perot intereferometers. Here's the first part of the question: Consider a beam of light undergoing multiple reflections in a Fabry-Perot cavity ...
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2answers
2k views

Why do light rays going to infinity form a real image?

My physics textbook tells me that when an extended object is placed at the focus of a concave mirror, the light rays reflect and go parallely towards infinity. Same happens when refraction occurs in a ...
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2answers
40 views

Can mirrors give rise to chromatic aberration?

Chromatic aberration is a type of image defect due to the fact that different wavelengths of light have different refractive indices. In almost all sources I read so far, this type of optical ...
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3answers
134 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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