- Withspeciallensesandprismswecanmanipulatethislight.Anyofthelenses,prisms,ormirrorsofanopticalinstrument.Yearsofeating,drinkingandsmokingstainthesecracksdarkerthantheenamelprisms.Thecurvedglasslensesateachendofthetelescopeactedlikeprisms.Thisarticlean...
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