General Studies · Inventions
द्विफोकसी चश्मे (Bifocal glasses) का आविष्कार किसने किया था?
- 1आइज़ैक न्यूटन
- 2इवेंजेलिस्टा टॉरीसेली
- 3बेंजामिन फ्रैंकलिन✓
- 4थॉमस अल्वा एडिसन
सही उत्तर देखें
बेंजामिन फ्रैंकलिन
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