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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: 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.

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โˆ™ 2009-07-16 03:20:30
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Q: Why light rays move straight through optical centre of lens?
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Why ANY light rays move straight through optical center of 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 a ray of light passing through a point in a lens does not undergo deviation?

When it passes through optical centre.

Define optical center?

Optical centre, in case of refracting lens, is the point in the lens through which when rays of light pass it would go undeviated.

Why light ray move straight through optical center?

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

What is called optical center of a lens?

optic centre is the geometrical centre of the lens the rays of light passing through this point emerges in the same direction without bending.

What allows light to pass through but not in a straight path?

This physical phenomenon is called refraction.

Why is the angle of incidence equal to angle of refraction in the case of a light ray passing through the optical centre of a convex lens?

Because this light ray passes through without being bent.

What happens when light passes through glass with the same optical density as air?

Nothing. It continues to travel in a straight line.

Can electricity be transmitted through optical fibers?

No. Light is transmitted through optical fibers.

How light travel through optical fiber?

Light travels through optical fibre with the phenomena of total internal refraction in zigzag motion

Can current can be passed through optical fiber?

No. Optical fibers only transmit light.

What is marginal rays?

Marginal rays are the light that passes through an optical system that is away from the optical axis.

When is light a ray and when is it not?

Rays are used to model the propagation of light through an optical system

Which kind of light is used to carry information through optical fibers?

Lasers are used to carry information through optical fibers. A laser, or coherent light, carries much more information than normal, incoherent light does.

How is light able to move through optical fibers?

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?

Which electromagnetic radiations can be transmitted through an optical fiber?

Visible light.

Which material will give straight lines when light passes through it?

Transparent objects allow light to pass through them in straight lines

What is the difference between material density optical density?

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.

What is a prism and what does it do to a white light?

A prism is a transparent optical element; in which light passes through. Like a vagina.

Which electromagnetic waves can pass through optical fiber?

Visible light, and some frequencies of ultraviolet light.

Does a rainbow go through the earth?

No a rainbow is the refraction of light through rain and is only an optical illusion

What kind of light is used to carry information through optical fibers?

The light used in optical fibres is either visible or infra red like my super whizzie broadband....

Does optical density affect the refraction of light through a substance?

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.

What happens to the light rays when they pass through the optical fiber?

Light goes under total internal reflection.

Light rays parallel to the optical axis are all reflected to pass through one point on the optical axis called the?

focal point