उस लेंस की फोकस दूरी ज्ञात कीजिए जिसकी क्षमता -2 5 D है यह किस प्रकार का लेंस ह
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lens helps us to see things easly and more helpfull for Pepole who use spaces to see the world . 25.D lens have more of scopeing things
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