If a light ray travels in air& passes sideways through a glass of water&comes out the other side.?
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1) air to glass\n2) glass to water\n3) water to glass\n4) glass to air
204272
Light travels faster than sound.
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You can't go the speed of light, but even if you were going 99.9999999% the speed of light, yes, you could shine the beam forward, backwards, or sideways, and it would look normal in every direction.  That's the central idea behind relativty.\n\nAnd NO, the light would NOT be going twice the speed of light.  Anyone who says that is BSing you.
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As light passes through more and more optically dense media, the speed at which light wave front propigates slows down and is bent.\n\nThe amount which the light ray is bent depends on the indicies of refraction of the two media (the one the light is leaving and the one it is entering).  Using Snell's law, we can calculate the angle as,\nn_1 * sin(angle 1) = n_2 * sin (angle 2)\nwhere n is the index of refraction and angle is the angle between the light ray and the normal line on the medium's surface.\n\nKnowing the index of refraction, we can calculate the speed of light in a particular medium.\nv = c / n\nwhere v is the speed of light through the medium, c is the speed of light in a vacuum, and n is the index of refraction.\n\nAs light passes from one medium to another, the speed at which it propigates slows down and the wavelength changes, however, the frequency of the light remains constant.
423752
When light travels through the glass prism, the electromagnetic wave(light) interacts with the atoms and atoms begin to act like tiny transmitters. the light radiated by atoms in the glass "interferes" with the "actual" light from the source\nto produce a "new wave" with its crests at the place where it should have been earlier(in your case where it should have been in future) if the glass had not been there.\nSo we say that the "phase velocity" of light has been increased(or reduced) inside glass by factor and that factor is (1/refractive index) . (i.e.) only the phase changes.if the phase of a wavefront was 5 radian then inside the material it would change to ,say,7 radian.\n        Thus "phase velocity" can be greater than c but the "group velocity" which can transmit information cannot exceed c. (i.e) if I shine light at an electron at a fixed distance and find the time taken by light to reach it and hence disturb it will be found equal to the time taken in the same experiment with the space between me and the electron filled with the medium.
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The heated air coming off the ground bends the light coming through it so that what you see appears to move or look like reflections in water. It has nothing to do with cones and rods other than that they are what you use to see all the time.
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Here's what happens: imagine you're standing with the Sun at your back looking at a water drop. As a light ray from the Sun hits the drop, it is bent inwards, toward the center of the drop. It bounces off the back of the drop (coming towards you again) and then refracts again on its way out. As a result you see the light ray appearing to come from some point behind the drop, that is, on the opposite side of the sky from the sun (which is where you see rainbows!) \n\n\nBut what about the colors? It turns out that each color of light is bent a little bit differently - red light is bent the least and violet the most. So, each color appears to be coming from a slightly different place behind the water drop. \n\nThe rainbow is circular because only drops located at certain places on the sky (in a circle around the point opposite the Sun) redirect the light exactly back toward your eye. It's only the light from those drops that you see, and hence you see a circle.\n\nanother explaination: This is difficult to envision and to describe, but we'll use some real common sense objects for our model. Picture yourslf standing in front of a tunnel, like you might find under a bridge - a nice even, round, smooth tunnel. Now, if you cast a shadow parallel to the ground, like a shadow from a power line (not the pole, the line - which is parallel to the ground) and let the shadow fall inside the tunnel, you can imagine that the shape of the shadow on the ceiling of the curved tunnel looks as though it is arced, even though the source of the shadow is a straight line. Can you picture that? This is what is happening in the atmosphere. The rainbow is actually a straight line, since light travels in a straight line. Its just that the straight line is falling across a 'fish bowl' like pocket of moist, reflective air, like our tunnel in the model. The rainbow appears, therefore, to be an arc.
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light travels as fast as it always travels, no matter what it shines through. Things block light, but it doesn't slow it down.
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All of the light "floating" in the air is composed of photons which are eventually absorbed by the atoms in the room and converted into heat.  This heat eventually dissapates through the walls and radiates outside the room.  Of course, there is an imperceptable delay between when the last photon leaves the light and is absorbed by the walls, but this happens at the speed of light and can't be seen by you or me.
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Whenever a ray enters from glass medium to air medium, the light is reflected as well as refracted. That is both reflection and refraction take place.\n\nWhen the angle of incidence (in glass) is zero, the angle of refraction (in air) is also zero. This is called normal incidence and there is no reflection inside the glass.\n\nWhen the angle of incidence is increased from zero, there is both reflection and refraction. For refection the angle of incidence is equal to the angle of reflection and for refraction the angle of refraction (in air) is greater than the angle of incidence (in glass).\n\nWhen the angle of incidence equals the critical angle there is both reflection and refraction. For refection the angle of incidence is equal to the angle of reflection and for refraction the angle of refraction (in air) equals 90 degree.\n\nWhen the angle of incidence exceeds the critical angle, then there is no refraction and there is only reflection and the angle of incidence is equal to angle of reflection.\n\nThe ray not only is reflected internally but also is totally reflected, i.e., there is no refraction.  That is there is TOTAL internal reflection.
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The above solution has to be repeated again on the inside of \nthe prism just before the light comes out the other side.\n\nThe light gets refracted twice, one on contact with the prism, and\nagain before exiting the prism.  So you have to calculate the\nangle of incidence on the inside of the prism given the apex\nangle of 46 and the refracted angle of 26.36. A geometry\nproblem. Then repeat above calculation.
65453
Light waves look some what like this ^v^v^v^v^v and when polarized only the light waves that are passing in the same direction will beable to pass through
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REFRACTION IS THE PHENOMENA\n\nWhen light travels from one medium to another, it bends. In other words, it changes direction and moves at different speeds in different mediums. This property of light is called “refraction”. \nWe also know that white light is made up of different colours. Different colors of light have different frequencies. Except in vacuum and air, they travel at different speeds in different mediums.\nIf you were to allow a beam of light to pass through a simple prism, it will bend when it enters the prism, when it leaves the prism it bends again. The different colours of the white light travel with different speeds inside the prism. The slanted surfaces of the prism makes the different colours emerge separately, thus in addition to bending light as a whole, a prism separates white light into its component colors. This splitting of light into its component colours is called dispersion, where prism is a dispersing element.\nThis is exactly what happens when the sun rays hit droplets of water. When the sunlight strikes a raindrop, the light is refracted (bent) because the light is moving from one medium(air) to another( water). Drops of rainwater can disperse light in the same way as a prism.. When the light comes out of the water droplet, the sun's rays (white light)have now been split into their component wavelengths (colors). In this way, each individual raindrop behaves just like a prism, dispersing white sunlight into its seven component colors and a rainbow is formed. \nThe rainbow we see is thus a result of many, many raindrops bending the sun's rays.
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Well.. you say white light it's not refracted by glass... Then if that's true, there shouldn't be a rainbow EVER, no?\nThat's the point, white light it's composed by several colors, that's why it's white. When it goes through a glass, it WILL be refracted, causing it to separate into different spectres of light. Of course, only a minimal part of it will be refracted, for those glasses are constructed in such a way to prevent it from doing so.
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yes why not ,light can pass through water        the answer is as follows    except opaque medium light can pass through any medium  but light cannot pass as much fast as in the air medium because acc:theory of huygens light can move fast in rarer medium than in denser medium
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By the same effect that causes uncurtained windows of a house bathed in sunlight to look darker than the rest of the house. The light goes further inside, so a greater proportion of it is diffused and absorbed internally, and less is reflected back out. The water acts as a light pipe, which you can demonstrate by holding a sheet of thin paper with a wet spot up to the light. The ref. provides a fuller explanation.
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As you know, the 'bending' of light changes its direction.\nSame thing happens to sounds - you can hear sounds from around a corner.