defence exam Indian Army Nursing Assistant Mock Test Series 2025 Physics Optics Mirrors and Images

यदि 'u' वस्तु दूरी है, 'v' प्रतिबिंब दूरी है और 'f' फोकस लंबाई है तो दर्पण समीकरण क्या होगा?

1
1 / v - 1 / u = 1 / f
2
1 / v + 1 / u = -1 / f
3
1 / v + 1 / u = 1 / f
4
1 / u - 1 / v = 1 / f
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