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(i) हीरे का अपवर्तनांक 2.42 है। इस कथन से क्या तात्पर्य है?

(ii) किसी लेन्स की 1 डाइऑप्टर क्षमता को परिभाषित कीजिए।

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(i) इस कथन से यह अभिप्राय है कि हीरे में प्रकाश की चाल निर्वात् में प्रकाश की चाल की 1/2.42 गुनी होगी।

(ii) डाइऑप्टर-1 डाइऑप्टर उस लेंस की क्षमता के बराबर है जिसकी फोकस दूरी 1 मीटर हो।

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