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In a periscope, the two plane mirrors are kept किसी परिदर्शी (पेरिस्कोप) में दो समतल दर्पण रखे जाते हैं

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In a periscope, the two plane mirrors are kept किसी परिदर्शी (पेरिस्कोप) में दो समतल दर्पण रखे जाते हैं






 
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