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Introduce
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Ball cap
Ball cap
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Product
Cylindrical lens
Germanium wafer
anti-reflection
Carbon film
Double convex lens
The ball cap
Flat convex lens
Flat piece of
filter
A prism
Infrared wavelengths
A light,
reflex
plate with silver
gold-plated
Punch window
Window piece
Octahedral prism
Concave convex lens
D20X3Spectrograph
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