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kriskras
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Gronings Zonnestelsel
Activity
kriskras
Zutphens (Gronings) Zonnestelsel
Activity
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Spiegelen met virtueel beeld
Activity
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Zutphens (Gronings) Zonnestelsel
Activity
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Lenzenformule
Activity
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Lenzenformule
Activity
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Lens: beeldconstructie
Activity
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