I am building a Thermometer. The problem is that I need the sensor to only detect temperature of an object at a distance of 25-40 cm. I was told that a Fresnel lens can help me concentrate the beam. Can anyone advise me on a good Fresnel lens to use? And help me with it.
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I am doing a master's in Physics and I believe I can help you with it. However, I need more information about the problem statement and the thermometer setup.