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अवतल दर्पण के वक्रता की त्रिज्या 30 सेंटीमीटर है। कार्टीजीयन साइन कन्वेंशन के अनुसार, इसकी फोकल लंबाई को किस तरह व्यक्त किया जाता है ?

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अवतल दर्पण के वक्रता की त्रिज्या 30 सेंटीमीटर है। कार्टीजीयन साइन कन्वेंशन के अनुसार, इसकी फोकल लंबाई को किस तरह व्यक्त किया जाता है ?






 
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