The focal length of a concave mirror is 20 cm. Find
the position of an object in front of the mirror so that
its real image is two times the size of the object
एक अवतल दर्पण की फोकस दूरी 20 cm है। दर्पण के सामने एक
वस्तु की स्थिति ज्ञात कीजिए ताकि इसका वास्तविक प्रतिबिम्ब वस्तु
के आकार का दुगना हो।
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