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15 सेमी फोकस-दूरी के उत्तल दर्पण के सामने 60 सेमी की दूरी पर एक वस्तु रखी है। प्रतिबिम्ब की स्थिति एवं प्रकृति ज्ञात कीजिए।

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Correct Answer - 12 सेमी (दर्पण के पीछे ) ,आभासी
u=60 सेमी , f=15 सेमी
सूत्र -`1/v=1/f-1/u`
या `1/v=1/15- 1/(-60)=1/15+1/60=5/60`
या 1/v=1/12
या v=12 सेमी
उत्तल दर्पण है अतः प्रतिबिम्ब दर्पण के पीछे बनेगा जो आभासी एवं सीधा होगा ।

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