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in Physics by (92.4k points)
दूर- दृष्टि दोष पीडित एक व्यक्ति न्यूनतम 0.50 मीटर की दूरी तक देख सकता है। उसे सही दृष्टि के लिये किस प्रकृति तथा कितनी फोकस – दूरी का लेन्स प्रयुक्त करना होगा । स्पष्ट दृष्टि की न्यूनतम दूरी 0.25 मीटर है।

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