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 s . If the object is moving uniformly, then its speed is

Question

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 s . If the object is moving uniformly, then its speed is, 3 k m h - 1, 4 k m h - 1, 5 k m h - 1, 6 k m h - 1

MARKS App · Accepted Answer

Using mirror formula, Or 1 u 1 = 3 25 - 1 10 Or u 1 = 50 m And ∴ 1 u 2 = 7 50 - 1 10 Or u 2 = 25 m Speed of object = u 1 - u 2 t i m e = 25 30 m s - 1 = 3 k m h - 1

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