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Combined Focal length and lens maker formula
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CTEVT Engineering Physics I ( Optics and Magnetism)
नमस्कार, मेरो नाम नवराज पोखरेल हो, मेरो जन्मस्थान गोरखा जिल्ला सिरानचोक गाँउपालिकामा भएको हो ।
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