engineering recuitment DRDO CEPTAM STA B Tier I (Sr. Technical Assistant) Mock Test 2022 General Science Physics Optics

फोकस दूरी और दर्पण की वक्रता की त्रिज्या के बीच का संबंध क्या है?

1
F = 2
2
R = f
3
R = 2f
4
R = f/2
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