याद रखने के लिए संकेत और सूत्र (Yād rakhne ke lie saṅket aur sūtra)
4 : लेंस संयोग
- लेंस संयोग सूत्र: $$(\frac{1}{f_{\text{प्रभावी}}} = \frac{1}{f_1} + \frac{1}{f_2}).$$
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