railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) Physics Optics Mirrors and Images

एक उत्तल दर्पण की फोकस दूरी क्या होगी जिसकी वक्रता त्रिज्या 30 cm है?

1
30 cm 
2
60cm
3
15cm
4
7.5 cm
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