Physics · Optics
मुख्य अक्ष के अनुदिश संपर्क में रखे गए 5 समरूप उत्तल लेंसों के संयोजन की प्रभावी क्षमता 25 D है। प्रत्येक उत्तल लेंस की फोकस दूरी है:
- 125 सेमी
- 2500 सेमी
- 350 सेमी
- 420 सेमी✓
सही उत्तर देखें
20 सेमी
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