railway RRB JE (CBT I + CBT II) Mock Test 2024 General Science Physics Optics

गोलीय दर्पण में फोकसान्तर एंव वक्रता त्रिज्या के बीच संबंध है?

1
r = 2f
2
f = r
3
f = 2/r
4
r = 2/f
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