When an object is kept at a distance of
from a concave mirror, the image is formed at a distance of
from the mirror. If the object is moved with a speed of 9
, the speed (in
) with which image moves at that instant is
When an object is kept at a distance of from a concave mirror, the image is formed at a distance of from the mirror. If the object is moved with a speed of 9 , the speed (in ) with which image moves at that instant is
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