All Categories UP Board 9th class UP Board 10th class UP Board 11th class UP Board 12th class
Vedaan Pathshala
33 days ago

दर्पण की फोकस दूरी (f) और वक्रता त्रिज्या (R) में क्या संबंध है ?
f = R
f = R/2
f =2R
f =3/2R
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