Physics · Ray Optics
एक समतलो-अवतल (plano-concave) लेंस की फोकस दूरी 10 cm है। यदि इसे इसके मुख्य अक्ष के अनुदिश दो बराबर भागों में काटा जाता है, तो प्रत्येक परिणामी भाग की क्षमता (power) का परिमाण क्या होगा?
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