Lens that will make the rays parallel to each other

  • Thread starter kishushah
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  • #1
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Main Question or Discussion Point

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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  • #2
K^2
Science Advisor
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Very easy. A lens with a focal point at infinity is called a window.
 
  • #3
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See the fig(attachment).I want to achieve this(shown in fig).
 

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  • #4
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That's just a normal lens, ray lines are independent of the direction of light.

I didn't realise collimators had any loss of intensity, are you using laser light or just a point source?
 
  • #5
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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.
 
  • #6
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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.
 
  • #7
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What frequency are we talking about?
 
  • #8
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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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