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लेजर एक उपकरण है जो किस प्रकार का विकिरण उत्पन्न करता है?

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3सहज उत्सर्जन
4उद्दीपित उत्सर्जन✓

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लेजर एक उपकरण है जो किस प्रकार का विकिरण उत्पन्न करता है?

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लेजर एक उपकरण है जो किस प्रकार का विकिरण उत्पन्न करता है?

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