(Old) Blindsided

What's the best way to position a car's mirrors?

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(Old) Blindsided

What's the best way to position a car's mirrors?

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A newer, better version of this lesson is available! Explore all updated lessons here, or read more about the updates in Our Community.

2023-2024 Versions

In the fall of 2024, Citizen Math released updated versions of every lesson in our library, plus a few new ones! We know you may have already prepped an earlier version or planned a repeat of last year, so we're continuing to make these earlier versions available through Thursday December 5, 2024.

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Click here for the updated version of this lesson!

Even under ideal conditions, driving is dangerous. To make the experience as safe as possible, cars come with a lot of mirrors to help drivers see what’s happening around them. So how do people typically position their car’s mirrors…and how should they position them?

In this lesson, students use reflections to model what drivers see in their rear-view and side-view mirrors. They see how adjusting the mirrors impacts the areas that drivers can see, and assess some common rules of thumb when it comes to the best way to orient your mirrors.

REAL WORLD TAKEAWAYS

  • A rear-view mirror should be angled slightly toward the driver in order to see the area directly behind the car.
  • Side-view mirrors will provide the most helpful visibility if they’re positioned so that you cannot see the edge of your own car but so that you can see an adjacent car just out of the area reflected in the rear-view mirror.

MATH OBJECTIVES

  • Reflect rays off of a rear-view mirror using the law of reflection
  • See how the area shown in a rear-view mirror changes when the driver adjusts the mirrors
  • Reflect rays off of side-view mirrors using the law of reflection
  • Assess the quality of rules of thumb for the best way to position your mirrors in a car

This complex task is best as a culminating unit activity after students have developed formal knowledge and conceptual understanding.
Expressions & Equations
Expressions & Equations
Content Standards
Mathematical Practices