Mathematics · Light - Reflection and Refraction
जब किसी वस्तु को एक अवतल दर्पण से 40 cm की दूरी पर रखा जाता है, तो दर्पण से 30 cm की दूरी पर एक वास्तविक और उल्टा प्रतिबिंब बनता है। दर्पण द्वारा उत्पन्न आवर्धन (magnification) क्या होगा?
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