Question
What is the focal length of a makeup mirror that has a power of 1.50 D?
Question by OpenStax is licensed under CC BY 4.0
Final Answer

0.667 m0.667 \textrm{ m}

Solution video

OpenStax College Physics for AP® Courses, Chapter 25, Problem 53 (Problems & Exercises)

OpenStax College Physics, Chapter 25, Problem 53 (PE) video thumbnail

In order to watch this solution you need to have a subscription.

Start free trial Log in
vote with a rating of votes with an average rating of .

Calculator Screenshots

  • OpenStax College Physics, Chapter 25, Problem 53 (PE) calculator screenshot 1
Video Transcript
This is College Physics Answers with Shaun Dychko. The power of a mirror is the reciprocal of this focal length or you can raise both sides to the exponent negative one to say that the focal length is the reciprocal of the power. So the mirror power we're given is 1.5 diopters which means the focal length is 0.667 meters.