railway DFCCIL MTS 2025 Mock Test Series General Science Physics Optics

निम्नलिखित में से कौन सा विकल्प दर्पण सूत्र का सही प्रतिनिधित्व देता है?

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