Who invented Bifocal Lens?
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Alfred B. Nobel
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Thomas Alva Edison
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Benjamin Franklin
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Rudolf Diesel
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Correct answer
Explanation
Benjamin Franklin invented bifocal lenses in the late 1700s to address both near and far vision problems, eliminating the need to switch between two pairs of glasses. Alfred Nobel is known for dynamite, Edison for the light bulb and phonograph, and Diesel for the diesel engine.
AI explanation
Benjamin Franklin is credited with inventing bifocal lenses in the late 18th century, combining two lens powers in a single pair of glasses so he could see both near and far without switching spectacles. The other names are inventors in unrelated fields (dynamite, the phonograph and light bulb, the diesel engine), so they don't fit this specific invention.