Physics · Optics
द्विफोकल (bifocal) लेंस का कौन सा भाग निकट दृष्टि की सुविधा प्रदान करता है?
- 1उत्तल लेंस वाला निचला भाग✓
- 2उत्तल लेंस वाला ऊपरी भाग
- 3अवतल लेंस वाला निचला भाग
- 4अवतल लेंस वाला ऊपरी भाग
सही उत्तर देखें
उत्तल लेंस वाला निचला भाग
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