Asked Dec 25, 2019

(a) Does your bathroom mirror show you older or younger
than your actual age? (b) Compute an order - of - magnitude
estimate for the age difference, based on data you specify.


Expert Answer



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Let the ray of light leaving the mirror be one event and the ray of light returning the face be another event. The time interval between these two events are a few nanoseconds. But the light travel between the person and the mirror and does not age at all. So the image in the mirror shows the person younger than the actual age. Conclusion: Therefore, the bathroom mirror shows less than the actual age.


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