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Question

Image of an object approaching a convex mirror of radius of curvature 20m along its optical axis is observed to move from 253m to 507m in 30 seconds. What is the speed of the object in km per hour ?

A
3
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B
2
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C
3.5
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D
3.2
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Solution

The correct option is A 3
Given, R=20m, f=10m

From the mirror equation;

1v1+1u1=1f

125/3+1u1=110

u1=50m

Further more when the picture of the question is at 507m.

1v2+1u2=1f

150/7+1u2=110

u2=25m

Contrast out there of the protest=3025=25m

Speed=relocation/time

=2530

=56m/s

Speed in km/hr=56×185

=3km/hr

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