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[" B-7.A point object on the principal a...

[" B-7.A point object on the principal axis at a distance "15cm" in front of a concave mirror of radius of "],[" curvature "20cm" has velocity "2mm/s" perpendicular to the principal axis.The magnitude of velocity of "],[" image at that instant will be: "],[" एक बिन्दुवत् वस्तु "20cm" वक्रता त्रिज्या वाले अवतल दर्पण की मुख्य अक्ष पर इससे "15cm" दूरी पर रखी है तथा इसका "],[" मुख्य अक्ष के लम्बवत् वेग "2mm/s" है। इस क्षण प्रतिबिम्ब के वेग का परिमाण है : "],[[" (A) "2mm/s,(B^(*))4mm/s," (C) "8mm/s," (D) "16mm/s]]

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