A man of height 'h' is walking away from a street lamp with constant speed 'v'.The height of the street lamp is 3h.The rate at which of the length of the man's shadow is increasing when he is at a distance of 10h from the base of the street lamp is
a)v/2
b)v/3
c)2v
d)v/6
form two triangles shadow triangle and men . these two will be similar
Now try to solve.