Railway RRB General Science Hindi MCQs - Light Waves — Flashcards | Railway Recruitment (India) | FatSkills

Railway RRB General Science Hindi MCQs - Light Waves — Flashcards

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यदि एक 10 सेमी. की फोकस दूरी वाले अवतल दर्पण को जल में डुबोया जाता है, तो इसकी फोकस दूरी–
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