Mathematics · Optics
एक अवतल लेंस (concave lens) के सामने 30 cm की दूरी पर एक वास्तविक वस्तु रखने पर उसका आभासी प्रतिबिंब लेंस से 20 cm की दूरी पर बनता है। लेंस की प्रकाशीय क्षमता (power) की गणना कीजिए।
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