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  4. What is the speed of the object (in kmh⁻1 ) if an 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?

Q. What is the speed of the object (in ) if an image of an object approaching a convex mirror of radius of curvature 20 m along its optical axis is observed to move from to in 30 s?

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Solution:

Using mirror formula,
Or
Or
And

Or
Speed of object

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