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Rotterdam Convention
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PET
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Sprain
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Miscible
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ISDB-T
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Shark feeding
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Sedimentary basin
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WHO
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Cementite
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Polar bear
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Spokes
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SIP
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Melanin
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Lithium-ion battery
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WPA
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Bennett's comet
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Erg
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Creatinine
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Coprocessor
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M17
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Absolute magnitude
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Homo heidelbergensis
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Pigment
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Systematic
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Mauritius parakeet
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Detrital deposit
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CRBPO / Centre for Research in Biology and Bird Population
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Spectral line
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Boundary area
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Genesis 1
Optical doublet
An optical doublet is a combination of two lenses with different refractive indices. It is used in eyepieces and in the objectives of refractive optical instruments. It is used to reduce chromatic aberration.
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