Optics - How long can I see an objects reflection

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SUMMARY

The discussion focuses on determining the duration an observer can see the reflection of an object moving at a constant velocity of 4 m/s in a mirror. The key to solving this problem lies in understanding the principles of optics, specifically the behavior of light reflection and the geometry of similar triangles. The observer's ability to see the reflection is contingent upon the relative positions of the observer, the object, and the mirror. The solution requires applying the concepts of light reflection and the geometry involved in the observer's line of sight.

PREREQUISITES
  • Understanding of basic optics principles, specifically light reflection.
  • Knowledge of similar triangles and their properties.
  • Familiarity with the concept of relative motion in physics.
  • Basic geometry skills to visualize angles and distances.
NEXT STEPS
  • Study the laws of reflection in optics, focusing on angles of incidence and reflection.
  • Learn about the concept of relative motion and how it applies to observers and moving objects.
  • Explore the use of similar triangles in solving problems related to reflections and angles.
  • Practice problems involving reflections in mirrors to solidify understanding of the concepts.
USEFUL FOR

This discussion is beneficial for physics students, educators teaching optics, and anyone interested in understanding the principles of light reflection and motion in relation to mirrors.

Paulo Serrano
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Optics -- How long can I see an objects reflection

Homework Statement


The object is traveling at a constant velocity of 4 m/s. Initially, the observer can not see the object. At a certain point, the observer can see the reflection of the object in the mirror. For how many seconds is the observer able to see the reflection of the object on the mirror?

http://img32.imageshack.us/img32/8514/mirrorquestion.jpg

Homework Equations



Don't know.



The Attempt at a Solution



I know that you have to see if the observer's image on the other side of the mirror can see the object to determine if it's visible to the observer. That's all I know, really. Does it have something to do with similar triangles?
 
Last edited by a moderator:
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Light reflects from a mirror at the same angle (to the normal) that it arrives.
 

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