Reflection Definition and 966 Threads

What is the law of reflection to the object, when it's perpendicular to the reflective surface. For example, if you face a mirror and stare eye to eye with the reflection- what is the angle?If I have understood correctly, the angle of incidence/reflection is equal, so if for the mirror is...

7. (a) A material having an index of refraction n = 1.30 is used as an antireflective coating on glass with an index of refraction n = 1.50 as shown. (i) What is the phase shift for the reflection at the interface between air and the coating (interface 1)? (ii) What is the phase shift...

Hi there! I have a question about the classical interaction of light with matter according the Drude-Lorentz model. Let's suppose that the light in matter has a wave-number k which in general is complex. Then the real part of k accounts for the propagation of light, while the imaginary part of...

In order for us to see something, the light photon needs to be reflected, not absorbed or transmitted? Then is it that the same frequency of visible light keeps falling on something, an apple is always red in white light, why does it reflect red?

Lambert's Cosine Law, Computing Diffuse Reflection : I have 2 coordinates (5, 6, 0) the light source and (2.3, 1.92, 0) the plane. The diffuse coefficient is 0.6 and the light source intensity is 200. So using the Lambert's Cosine Law, I need to take 0.6 * 200 * the dot product of the...

Hi all, From what I understand, total internal reflection reflect 100% of light. Suppose you had a transparent material with a critical angle of 45 degrees. Now say you had a cone with a 45 degree angle, and you shined monochromatic light in through the base. Would 100% be reflected (minus...

Homework Statement Find a basis B of R^n such that the B matrix B of the given linear transformation T is diagonal. Reflection T about the plane x_1 - 2x_2 + 2x_3 = 0 in R^3. The Attempt at a Solution I just don't even know where to begin. I don't know how to interpret problem or how to...

Homework Statement 1.if you were to paint a house that reflects heat during summer and radiates heat during winter nights. which color should a house be painted? green, red, black, white, or pink? 2. why do gardeners mix soot in the soil? The Attempt at a Solution 1.i say it is...

I'm confused as to how the diffuse reflection is computed as : \frac{1} {\pi} * LightRadiance * cos(\theta) Where cos(\theta) is the angle between the light and the surface normal, and accounts for the light projected onto the surface When considering light reflecting at a point from some...

http://www.screencast.com/users/trinhn812/folders/Jing/media/07c73e88-45a9-4703-91e1-237b20135d2c I'm not sure why the answer is A. I tried reasoning myself that it has to do with the critical angle, but I can't seem to convince myself.

Hey all, I am new to these forums. I am thinking of taking a distance learning degree in the near future from Open University in Physics, so decided to do some reading up first as it has been a while since I hav etuched physics. Anyway I am reading a book at the minute "Quantam Theory cannot...

Here's the problem : Air flows in a passage with an initial Mach No. 2. Determine maximum turning angle A for which 3 regular reflections (i.e. no Mach reflection) of the original oblique shock are possible? Now, what exactly is a mach reflection? Also, what is the minimum Mach number...

what causes the reflection of light from a surface?? why can't light simply move through the shiny surface that reflects it...ya difference in penetrating strength... if we try to explain it at the microscopic level... why would the particles of the shiny surface make it bounce back making an...

i wonder how it's possible that due to reflection from water say of light only perpendicular components remain and others are refracted.

How would the reflected light from the sun or moon apear if the water surface were perfectly smooth?and why does reflected light from the sun or moon appear as a column in the body of water like here http://www.free-slideshow.com/screens/waves_sunsets/sun-over-the-ocean.jpg

How do free electrons of metals reflect photons? I had read that they first absorb and then emit the photon but if they are free (not bound to an atom and thus not fixed to any old energy level) why should they lose their energy on the first place? Surely they don't have to drop to their...

Why do we measure the angle of incidence or reflection (or say refraction even) w.r.t normal to the surface and why not w.r.t the horizontal surface?

Homework Statement 3. Consider the reflection from the boundary between air and an absorbing medium. We can use the usual Fresnel Equations, but with a complex refractive index for the absorbing material. For various angles of incidence, use the real parts of the refractive index to...

I wonder why is there a gap at the starting of the reflected light when i conduct this experiment? Can anybody explain this to me? Thanks!

I've attached the multiple choice question. The first time round that I did it, I simply just did a phase shift of the whole graph by pi. Basically I just translated the whole graph by pi, resulting in option (D). However, it later came to my attention that by continuing to draw the...

Homework Statement For a beam of light shone on a prism, the reflected beams will give twice the angle of the prism. Homework Equations We know that the angle between the incident ray and the normal = angle between reflected ray and normal The Attempt at a Solution i tried drawing...

[b]1. A person riding in a boat observes that the sunlight reflected by the water is polarized parallel to the surface of the water. The person is wearing polarized sunglasses with the polarization axis vertical. If the wearer leans at an angle of 17.0 degrees to the vertical, what fraction...

:bugeye:Hi All... I am really confused about the mechanism of loss of energy when an EM wave hits a metal surface. I always thought the reflection was due to the motion of the electrons in the metal (due to the electric field of the wave). Which suggests that resistive losses would come...

Okay so in a problem I have a vector reflecting off a mirror. I have the equation for the normal of the mirror at the coordinates where the vector of light hits the mirror. The normal of the mirror and the vector incident are in the same geometric plane. How do I find the refection of the vector...

An Example Scenario: A particle moves at 32° and collides with a wall. This wall is rectangular in nature, which means that there is both horizontal and vertical sides. On a horizontal tangent, it would work like this (sorry for ugly, not-to-scale diagrams)...

Homework Statement If I have a coaxial transmission line, with a resistor halfway through, and another resistor at the end, how do I calculate the reflection coefficient for the spot where the resistor is halfway? Here is a diagram of what I mean. Dashes and dots are are the lines, and }...

If the question was that why are some materials opaque and why some are transparent, the answer would be found in the energy bands. If energy bands allow such transitions for electrons, that they can absorb photon, then they will absorb it, and the photon does not go through the material. If...

I’ve heard that the reason radio telescope dishes can be made out of wire mesh is because, so long as the size of the holes is less than (I believe) 1/10 the wavelength of the radio wave, the wave be reflected (it will see the dish as being solid). I was wondering what the physical reason was...

Hey guys, I need some notes on refraction please I don't know anything on it. Also I need to how to get ( draw ) the image of an object behind a mirror step by step please. That would really help me guys.

I would like to know if there is change of phase during total internal reflection. (In particular I would like to know if I can cover copper with several microns of glass and have it reflect 200 MHz EM waves coming from water (epsilon(H2O)=80, epsilon(glass)=4)).

My first (successful) post, hope this isn't silly/trivial. Also hope this is the appropriate area for optics-related questions. While debugging some code that applies the Fresnel equations to transmission of light through multiple layers of planar media, I encountered an interesting feature...

Suppose you have the plane given by \bold n \cdot (\bold r-\bold r_0)=0 where \bold n is the normal vector to the plane which passes through the point \bold r_0. What is the reflection x' of a point x across this plane?

A mixture of red and violet light is incident on a glass-air interface. The indices of refraction for red and violet light in glass are n(red)=1.52 and n(violet)=1.538. What color of light enters the air? http://www.webassign.net/cj8/q_10.gif attempt to solve: I found that the critical angle...

What is the explanation for the phase change of pie that occurs when a light ray gets reflected from an optically denser medium? This fact was demonstrated by the Llyod's mirror experiment, but what is the theoretical explanation for it? Thanks

I just want to make sure I understand this clearly. Light travels at 186 000 miles/second right? So if something was 10 light years away would that mean that it would take 10 years going at the speed of light to get there? Wouldnt it be possible to make a probe go even half that speed? I don't...

I'm wondering if anybody could suggest some techniques that might be brought to bear on the following problem: Suppose a finite sequence M_1,M_2,\dots,M_k of 4\times 4 orthogonal reflection matrices is given. I'm interested in determining conditions on these matrices that will guarantee that...

Homework Statement A laser beam is incident on the left mirror in the figure below, in which α = 85°. Its initial direction is parallel to a line that bisects the mirrors. What is the angle ϕ of the reflected laser beam? http://www.webassign.net/knight/p23-40.gif" Homework Equations...

Question 1 1. Homework Statement The drawing shows a snapshot of a transverse wave traveling along a string at 9.6 m/s. The equation for the wave is y(x, t) = A cos(ωt + kx). At what times could this snapshot have been taken? (Give the three smallest nonnegative possibilities.)The Attempt at a...

Hi I am new to this forum but have been interested in reading many threads and would like to know if any of the experts could help. I am looking to make a circuit that I can measure different output levels of a photodiode from the amount of "signal" reflected onto it from a particular...

Verify that M(theta) is orthogonal, and find a unit vector n such that the line fixed by the reflection is given by the equation n . x = c, for a suitable constant c, which should also be determined. --------------- I did the verficiation part, by multiplying m(theta) by its...

If I have a long coaxial wire with open end and apply a short voltage pulse, that pulse begins propagating through it until it reaches the end. Then, it reflects back to where it came from. I understand that it behaves like a normal wave, maintaining its energy and bouncing when it reaches a...

I have searched topics like reflection forum and I always seem to get different answers. I'm hoping to reconcile all of this, I've read FAQs, threads, wikipedia... To explain reflection I've heard these 3 explanations: 1) Light is absorbed by an atom, then re-emitted at a later time randomly...

What is the QED explanation for specular reflection of light ? I mean, if photons interact with electrons, and a photon is re-emitted, I assume it can be emitted in any direction whatsoever. So this might work great for diffuse reflections. But what about specular reflections? How are they...

A laser beam traveling in air strikes the mid- point of one end of a slab of material with index of refraction 1.45 as shown in the figure below. Dimensions of Block 46mm (L) and 3.4mm (W) Initial ray of light enters the slab from the left side at an angle of incidence of 39 degrees...

An isotropic solid has a refractive index of 10 at low frequencies. A 10 um thick platelet of this solid with perfectly polished planes shows two absorption bands in optical transmission. These bands, corrected for reflection, have a (negative) Gaussian shape. They occur at frequencies of 3x1012...

Homework Statement A plane wave is incident at 70˚ to surface normal traveling within a medium with relative permittivity = 4, striking the boundary with air. Where is the nearest magnetic field max. to the boundary in the initial medium? Find the 1/e penetration depth of the evanescent...

Homework Statement What is the maximum value of θ1 that would cause total internal reflection to occur? N1 = 1.3, n2 = 1.6 (picture attached) Homework Equations Critical angle = sin^-1(n1/n2) The Attempt at a Solution I figured the critical angle to be 54.3. That means that...

Hi, I have been looking for a better explanation of the following question in different threads, but although there are some related question, I haven't found one that answers my question. I have read in Atkins-Physical chemistry book the following (summarized) explanation about why metal...

The resistivity for thin films can be obtained using Fuchs theory \rho = \left[1-\left(\frac{3}{2\kappa}\right)(1-p)\int_1^\infty\left(\frac{1}{t^3}-\frac{1}{t^5}\right)\frac{1-\exp(-\kappa t)}{1-p\exp(-\kappa t)}\mathrm{d}t\right]^{-1} \rho_0 where p is the probability that an electron...

Homework Statement Find the reflection coefficient for electrons traveling toward a potential change from V to V_0 with a total energy E > V_0. The potential diagram is just a unit step function. It goes from V = 0 to V = V_0 at x=0. In piecewise notation: \begin{displaymath} V(x) =...