Paraxial Rays: Definition & Diagrams

Thread starter Ashu2912
Start date Oct 21, 2010
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Optics Rays

In summary, paraxial rays are a type of light ray that are close to the optical axis and make small angles with it. They are used in geometric optics to simplify calculations and describe the behavior of light in simple optical systems. They are significant in optics for their ability to simplify calculations and aid in the design of lenses and mirrors. In diagrams, they are represented as straight lines or dotted lines to approximate the path of light. However, they are not accurate for describing light propagation in complex systems, where more advanced techniques are required.

Oct 21, 2010

Ashu2912

Can someone tell me what are paraxial rays in brief. It would be better if there will be some diagram or visual!

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Oct 21, 2010

Andy Resnick

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Paraxial rays are rays that don't deviate very much- sin(q) ~ q. Alternatively, these are rays that are always close to the optical axis- large f-number, low NA systems.

1. What are paraxial rays?

Paraxial rays are a type of light ray that are close to the optical axis of a lens or mirror. They are used in geometric optics to simplify calculations and describe the behavior of light in simple optical systems.

2. How are paraxial rays different from other light rays?

Paraxial rays are different from other light rays in that they are close to the optical axis and make small angles with the axis. This allows for easier calculations and simplifies the description of light in simple optical systems.

3. What is the significance of paraxial rays in optics?

Paraxial rays are significant in optics because they allow for simplification of calculations and the description of light in simple optical systems. They are also important in the design of lenses and mirrors for use in various optical devices.

4. How are paraxial rays represented in diagrams?

In diagrams, paraxial rays are typically represented as straight lines that are close to the optical axis. They may also be represented as dotted lines to show that they are not the actual path of light, but rather an approximation for calculation purposes.

5. Can paraxial rays be used to accurately describe all types of light propagation?

No, paraxial rays are only accurate for describing light propagation in simple optical systems. In more complex systems, such as those with curved surfaces or varying refractive indices, paraxial ray approximation may not be accurate and more advanced techniques must be used.