How to calculate the focal length and focal point of collimator?

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Discussion Overview

The discussion revolves around calculating the focal length and focal point of a collimator, specifically focusing on a detector's active area. The context includes parameters such as the collimator diameter and the dimensions of the active area.

Discussion Character

  • Exploratory
  • Homework-related

Main Points Raised

  • One participant seeks to calculate the focal length and focal point of a collimator with a diameter of 3mm and an active area of 100 micrometres.
  • Another participant inquires about the input for the calculation and whether it is related to homework or a school lab.
  • A subsequent post corrects the active area measurement to 180 µm and reiterates the lens diameter of 3 mm.
  • A later reply suggests that the provided information may be insufficient for the calculation and requests additional details, such as a sketch of the situation.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus on the adequacy of the provided information for the calculations, indicating that multiple views on the necessary details remain.

Contextual Notes

The discussion highlights potential limitations in the information provided, such as missing assumptions and the need for a clearer representation of the situation.

Barbossa
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TL;DR
I wanted to calculate the focal length and focal point of the collimator. The collimator diameter is 3mm and I wanted to focus on the 100-micrometre active area of the detector.
I wanted to calculate the focal length and focal point of the collimator. The collimator diameter is 3mm, and I wanted to focus on the 100-micrometre active area of the detector.
 
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Hello @Barbossa ,
:welcome: !​
That is very interesting. Do you have any input for your calculation ?

Is this homework or a school lab ?
##\ ##
 
Hi
Thanks!. Yeah! The detector active area is 180 µm and lens diameter is 3 mm.
 
Yes, you said that. Do you realize that isn't enough ? What about a sketch of the situation, and what it is that you want to do -- exactly.

##\ ##
 

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