railway RRB JE (CBT I + CBT II) Mock Test 2024 Physics Optics Mirrors and Images

गोलाकार उत्तल दर्पण की वक्रता त्रिज्या r से फोकस दूरी f का संबंध है:

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