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एक अभसारी लेन्स (अपवर्तनांक 1.5 ) की वायु में फोकस-दूरी 20.0 सेमी है | इसे जल (अपवर्तनांक 4/3 ) में डुबाने पर इसकी फोकस-दूरी तथा व्यवहार पर क्या प्रभा

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एक अभसारी लेन्स (अपवर्तनांक 1.5 ) की वायु में फोकस-दूरी 20.0 सेमी है | इसे जल (अपवर्तनांक 4/3 ) में डुबाने पर इसकी फोकस-दूरी तथा व्यवहार पर क्या प्रभाव पड़ेगा ?
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फोकस-दूरी बढ़कर 80.0 सेमी (चार गुनी ) हों जायेगी, अतः इसका व्यवहार पहले से कम अभसारी होगा |
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