Lens that will make the rays parallel to each other

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    Lens Parallel Rays
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SUMMARY

The discussion focuses on the need for a lens that can make light rays parallel while maintaining intensity, specifically in the context of using output from a parabolic antenna. Participants clarify that a lens with a focal point at infinity is referred to as a "window." To achieve parallel rays, a two-lens system is recommended: the first lens focuses the light, and the second lens, placed at the focal point of the first, outputs parallel rays. The application involves microwave frequencies, drawing parallels between electromagnetic waves and light properties.

PREREQUISITES
  • Understanding of lens types, specifically collimator lenses and their functions.
  • Knowledge of focal lengths and their significance in optical systems.
  • Familiarity with parabolic antennas and their applications in microwave technology.
  • Basic principles of electromagnetic wave behavior and properties.
NEXT STEPS
  • Research the design and application of collimator lenses in optical systems.
  • Explore the principles of focal lengths and how they affect light propagation.
  • Investigate the use of parabolic antennas in microwave communication.
  • Learn about the properties of electromagnetic waves and their similarities to light.
USEFUL FOR

Optical engineers, microwave communication specialists, and anyone involved in designing systems that require precise light manipulation and intensity preservation.

kishushah
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i need a lens that will make the rays parallel to each other & focal point at infinite.without much loss in the intensity.collimator lens kind of action but not at the cost of intensity.
 
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Very easy. A lens with a focal point at infinity is called a window.
 


See the fig(attachment).I want to achieve this(shown in fig).
 

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That's just a normal lens, ray lines are independent of the direction of light.

I didn't realize collimators had any loss of intensity, are you using laser light or just a point source?
 


That's just a normal lens, ray lines are independent of the direction of light.
i am not getting this.



Its not laser light it is the output from a parabolic antenna.with the beam angle of about 10-15degree.
 


I 'm not sure i fully understood your question but you try using two lenses.
The 1st (focal length f1) to focus the light at a point and the 2nd (focal length f2) to get a parallel ray output.
The 2nd lens must be placed with its focal length at the focus point of the 1st i.e., at a distance f1+f2 from the 1st.
 


What frequency are we talking about?
 


microwave.have heard somewhere all the emwaves have the same properties as light.parabolic antenna is an example of that,as reflection of radio-microwaves is observed here just like light.
 

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