1.

Image of an object approaching a convex mirror of radius of curvature 20 m along its optical axis is observed to move from 25/3 m to 50/7 m in 30 seconds. What is the speed of the object in km per hour?

Answer»

f = 10 m for v = 50/7 m, u = -25 m

for v = 25/3, u =-50 m, t = 30 s

speed = (25 m/30 s) = 3 Km /hr



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