railway RRB Technician Grade 3 Mock Test 2024 General Science Physics Optics

एक गोलीय दर्पण की वक्रता त्रिज्या 15 cm है। इसकी फोकस दूरी ज्ञात कीजिए।

1
9 cm
2
8.5 cm
3
7.5 cm
4
2.7 cm
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