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Blake
Taiga
MaxineAll materials which allow the transmission of light through them reduce the speed of light to some degree. A vacuum does not affect the speed of light but glass or water or any other material does slow it down.
When light (or any electromagnetic wave) is slowed down it is said to be refracted (bent).
The degree to which the light is bent is dependent upon the material and is calledthe index of refraction.
Look up achromatic lenses and crown glass to learn more.
See also "angle of incidence and angle of refraction".
Jim
Assuming that the glass block is optically uniform and has parallel faces, light will refract (bend) toward the glass, the optically denser medium if it strikes at an angle between perpendicular to the face up to the angle of incidence where it reflects from the surface (critical angle). That means that in a beam of white light the entire beam bends but, the red is slowed more by the optical density of glass than blue so it refracts more if the light enters the block at an angle.
If the light ray passes through perpendicularly to the parallel faces of the glass block, it will pass through with no noticeable effect. If the light passes through in such a manner that it emerges on the opposite parallel face of the block, the colors will fairly well re-construct to produce a beam of white light that emerges parallel to the original beam, but shifted towards the block. The reconstruction is not perfect because blue follows a less exaggerated path than the red so, depending on the angle, you may notice some chromatic aberration (color fringes).
This all presumes that the light is passing from air (less dense) into the glass block (more dense) and back into air. If the light were passing from an optically denser medium than the glass block such as diamond, the light would bend away from the glass, the less dense medium.
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What happens when light hits a bent piece of glass?
Some of the light is reflected off the glass at the same angle - in a manner and angle similar to that of a ball deflected off a surface at a similar angle. This is what happens when light reflects from car windows into our faces. Much of the light, however, will penetrate the glass, so that the light source is seen from the other side. Nevertheless, on contact with the glass, the light that penetrates will be refracted (bent) and travel through the glass at a different angle from that of its original contact with the glass; but once having travelled through the glass, it will leave at its original angle of contact. The amount of refraction depends on a number of factors, but especially, on the thickness of the glass and specific angle of contact involved. So, the light bends as it passes through the glass, but leaves at its original angle.
What happens when a ray is directed at a glass box?
when a ray box is shown at a mirror it reflectes
When light enters a pair of glasses it when it hits the glass.?
There is insufficient information for us to even begin to understand this question. Please edit the question to include more context or relevant information. When it hits the glass, light does several things. Some of it is reflected. Some of it is absorbed as it travels through the glass and the rest of it is transmitted through the glass. Light that strikes the glasses at anything other than right angles is also refracted - its path is bent.
When light enters glass from air it changes direction. What is the change of direction called?
If the light is entering from air or a vacuum, the light will slow down. The affect of this, if the light hits the glass at an angle, is that the direction of the light will change.
When a glass rod is immersed in the colourless liquid the glass rod seems to be deappeared why?
Hey! The reason it seems to disappear is because of the refraction and absorption of light and colour. When light enters the colourless liquid, colour is obviously absorbed. The light waves refract ("bounce") off the glass test tube and leave the glass beaker (containing the colourless liquid). Because the liquid and solid are the same colour, it creates the illusion of the test tube disappearing.
