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Basic Optical Principles
Practice Exercises

Calculate the focal length of the following lenses powers. Express the answer in meters, centimeters, and millimeters.

  1. -2.50

  2. -1.75

  3. -0.50

  4. -5.00

  5. -12.50

  6. +1.75

  7. +3.25

  8. +1.00

  9. +6.50

  10. +17.00


    Calculate the power in diopters of the lenses with the following focal lengths. Be sure to convert the given focal lengths to meters before applying the formula. Round off each answer to the nearest quarter diopter.


  11. -0.20 m

  12. -33 cm

  13. -4 m

  14. -5.5 cm

  15. -0.15 m

  16. +0.210 m

  17. +044.0 cm

  18. +80.0 cm

  19. +0.125 m

  20. +62.0 mm

(answers on last page)

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