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physical object > artifact > device > instrument > optical device > wavefront modifier > mirror > tertiary mirror |
tertiary mirror comparison table |
Subject | is a kind of | has definition |
---|---|---|
mirror | wavefront modifier | |
tertiary mirror | mirror | The third mirror to be encountered by the light in a telescope system. A tertiary mirror is required on alt-az telescopes to direct light to the stationary Nasmyth foci. |
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