Two thin lenses of focal lengths f 1 and f 2 are placed in contact. The focal length of…
Physics · JEE Main · NTA Exams — Optics
Two thin lenses of focal lengths f1 and f2 are placed in contact. The focal length of the complete lens is
- \(\frac{f_{1}+f_{2}}{2}\)
- \(\frac{f_{1}+f_{2}}{f_{1} f_{2}}\)
- \(\sqrt{\mathrm{f}_{1} \mathrm{f}_{2}}\)
- \(\frac{f_{1} f_{2}}{f_{1}+f_{2}}\)
Answer
(D) f_ 1 f_ 2 f_ 1 +f_ 2
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