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# A point object is moving a speed of 2m/s perpendicular to principle axis of a concave mirror of focal length 10 cm. When the object is at principle axis is at distance 15 cm from the mirror , the speed of the image will be 2 m/s    4 m/s 1 m/s 3 m/s

768 Points
3 years ago
Dear Ankur,
i am getting answer as 8m/s .
velocity of image = v2/u2.du/dt  and m = -v/u = 2 so velocity of image = 2 x 2 x 2 = 8m/s.
this is not given in your option
Thanks and Regards
Physics solver
26 Points
one year ago
when object moves perpendicular to principal axis the velocity of image is given by
$v_i=mv_o$
if m is negative then image moves in opp direction of object’s motion.
$m={f\over f-u}$
m=-2
$v_i=-4m/s$