Light beams are bent when they go through a material at an angle. If the direction of travel of the light beam is exactly perpendicular or 90° from the plane of the surface, than the light is not bent. A lens is usually curved on one side. However, exactly in the middle, the surface of the glass is parallel to the flat surface on the other side. So if light enters through the middle, the surface right in the middle will be perpendicular to the path of the light beam. (This works the same for lenses curved on both sides, as in the middle of both sides, the glass surface will be parallel to the opposite side). See this link: http://en.wikipedia.org/wiki/Image:Lens2.svg If the dashed line in the diagram is the light beam, you can see that where is crosses the lenses, the angle is always 90°. If the dashed line were moved up or down on the page however, the angle wouldn't be 90° anymore, and the light would be bent as it passed through the lens.
when the ligt ray passes through optical centre it does not refract because when the ligt rays passes through other part of lens it converge or diverge so we assume that the optical centre has no power converge or diverge so the ray does not refract through he optical centre
When it passes through optical centre.
Optical centre, in case of refracting lens, is the point in the lens through which when rays of light pass it would go undeviated.
as per the law of reflection angle incidence=angle reflection and angle is measured with respect to normal so when it passes from centre its normal,its incident ray, its reflected ray becomes in straight line
optic centre is the geometrical centre of the lens the rays of light passing through this point emerges in the same direction without bending.
This physical phenomenon is called refraction.
Because this light ray passes through without being bent.
Nothing. It continues to travel in a straight line.
No. Light is transmitted through optical fibers.
Light travels through optical fibre with the phenomena of total internal refraction in zigzag motion
No. Optical fibers only transmit light.
Marginal rays are the light that passes through an optical system that is away from the optical axis.
Rays are used to model the propagation of light through an optical system
Lasers are used to carry information through optical fibers. A laser, or coherent light, carries much more information than normal, incoherent light does.
isn't that what optical light is? like you know on certain fake Christmas trees ,, they have those lights in them that change colors; not tree lights but optical lights?
Transparent objects allow light to pass through them in straight lines
Material density is "regular" density. Take lead. It is heavy for a small volume of it; it's pretty dense. Water? Not so much. Lead sinks in it. Wood, however, floats on water (at least most kinds of wood). That's material density. Weight per unit of volume of the material. Material density. Optical density is a term applied to how well light passes through a material. If light is little affected passing through it, that is, if almost all the light goes through it that goes into it, it has a very low optical density. Like clear glass. Very low optical density. Start coloring the glass and less light can get through it; it has a higher optical density than clear glass. The amount of light that can get through a material is addressed in its transmittance, and the amount of light that is "blocked" by a material is addressed in its opacity. There you go. We've just given you a good jumping off point for your study of optics. The difference is pretty straight forward. Material density has to do with mass (weight) per unit volume of material. It's a measure of the affect of gravity on a given volume. Optical density is has to do with the passage of light - electromagnetic radiation (in optical wavelengths) - through a given material. The more the light can get through, the lower the optical density.
A prism is a transparent optical element; in which light passes through. Like a vagina.
Visible light, and some frequencies of ultraviolet light.
No a rainbow is the refraction of light through rain and is only an optical illusion
The light used in optical fibres is either visible or infra red like my super whizzie broadband....
No refraction is the measure of the speed that the light travels through the substance, optical density is a measure of how much it is absorbed. Refer to the related link in the Related Links section below.
Light goes under total internal reflection.