Your camera’s zoom lens has an adjustable focal length ranging from 80.0 to 200 mm. What is its range of powers?
Question by OpenStax is licensed under CC BY 4.0
Final Answer

5 DP12.5 D5\textrm{ D} \leq P \leq 12.5 \textrm{ D}

Solution video

OpenStax College Physics for AP® Courses, Chapter 25, Problem 37 (Problems & Exercises)

OpenStax College Physics, Chapter 25, Problem 37 (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 37 (PE) calculator screenshot 1
Video Transcript
This is College Physics Answers with Shaun Dychko. Power of a lens in dioptres is the reciprocal of the focal length written in meters and so the minimum power is going to be the reciprocal of the maximum focal length and we are told that it's 200 millimeters and we write 200 times ten to the minus three meters in that denominator here and this gives a power of five dioptres and for the maximum power, we'll take reciprocal of the minimum focal length which is 80 millimetres and that is 12.5 dioptres and so the powers greater than or equal to five dioptres but less than or equal to 12.5.