Lens that will make the rays parallel to each other

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    Lens Parallel Rays
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Discussion Overview

The discussion revolves around the design of a lens system intended to produce parallel rays of light with a focal point at infinity, while minimizing intensity loss. Participants explore the concept of collimation and the specific requirements for achieving this effect using different types of lenses.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant seeks a lens that can collimate light without significant intensity loss, suggesting a need for a specific optical configuration.
  • Another participant humorously suggests that a window could serve as a lens with a focal point at infinity.
  • A participant references an attachment to clarify their desired outcome, indicating a visual representation of the concept.
  • There is a discussion about the nature of the light source, with one participant noting that the light is not laser light but rather output from a parabolic antenna, which has a beam angle of about 10-15 degrees.
  • One suggestion involves using two lenses: the first to focus the light and the second to produce parallel rays, with specific placement requirements based on their focal lengths.
  • A question is raised regarding the frequency of the light being discussed, leading to clarification that the context involves microwaves.
  • Another participant comments on the similarities between electromagnetic waves and light, referencing the behavior of microwaves in relation to parabolic antennas.

Areas of Agreement / Disagreement

Participants express differing views on the effectiveness of various lens configurations and the implications of using different types of light sources. The discussion remains unresolved, with multiple competing approaches and no consensus reached on the optimal solution.

Contextual Notes

There are limitations regarding the assumptions made about the type of light source and its properties, as well as the specific requirements for intensity preservation in the collimation process.

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).
 

Attachments

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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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