किस दशा में लेन्स की प्रथम � – InterviewSolution

1.	किस दशा में लेन्स की प्रथम फोकस दूरी का मान उसकी द्वितीय फोकस दूरी के मान के बराबर नहीं होता है?
Answer» जब लेन्स के दोनों ओर माध्यम भिन्न-भिन्न होता है।

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