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Axis ANVE Exam - Topic 8 Question 124 Discussion

Why is germanium used for thermal camera lenses?
D) It is transparent to the infrared wavelengths
A) It is inexpensive
B) It has a low index of refraction
C) It has high optical dispersion

Axis ANVE Exam - Topic 8 Question 124 Discussion

Actual exam question for Axis's ANVE exam
Question #: 124
Topic #: 8
[All ANVE Questions]

Why is germanium used for thermal camera lenses?

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Suggested Answer: D

Germanium is used for thermal camera lenses because it is transparent to infrared wavelengths. This transparency allows infrared radiation to pass through the lens and reach the camera sensor, enabling the capture of thermal images. Germanium's optical properties make it an ideal material for thermal imaging applications. Reference: Axis Communications thermal camera specifications and technical documentation.


by Veronique at Apr 09, 2026, 06:06 AM

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Brigette
5 days ago
B is interesting, but D is more relevant for thermal cameras.
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Vannessa
10 days ago
I feel like A is misleading. Germanium isn’t that cheap.
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Rochell
15 days ago
Agreed, D makes sense. It’s transparent to IR wavelengths.
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Yuki
20 days ago
I think D is the best choice. Germanium is great for infrared.
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Regenia
26 days ago
High optical dispersion is a bit misleading though, right?
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Edelmira
1 month ago
Low index of refraction is a plus too!
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Annette
1 month ago
Really? I thought it was more expensive than other materials.
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Dana
1 month ago
Totally agree, that's the main reason.
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Salena
2 months ago
It's transparent to infrared wavelengths!
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Nenita
2 months ago
High optical dispersion? Not sure about that one.
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Destiny
2 months ago
Low index of refraction is a plus too!
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Kayleigh
2 months ago
Really? I thought it was too expensive for that.
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Marguerita
4 months ago
Totally agree, that's the main reason!
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Eve
4 months ago
It's transparent to infrared wavelengths!
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Ezekiel
4 months ago
I’m a bit confused; I thought germanium was chosen for its optical properties, but I can't recall if it was about dispersion or refraction.
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Fatima
4 months ago
I practiced a similar question about lens materials, and I think the transparency to infrared is definitely a key factor for thermal imaging.
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Laura
5 months ago
I remember studying about materials for lenses, and I feel like low index of refraction was mentioned, but it seems less relevant for thermal cameras.
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Kassandra
5 months ago
I think germanium is used because it's transparent to infrared wavelengths, but I'm not completely sure if that's the only reason.
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