focal length flipcards
Calculate the lens power of the shown focal lengths. Round each power to the nearest quarter diopter. Flip the card to reveal the answers!
Next Page
-0.20 m
Flip
How to solve: -0.20 m - you do not need to convert the measurement f = 1/f f = 1/-0.20 f = -5.00
-5.00
Next
-33 cm
Flip
How to solve: -33 cm - you need to convert the measurement -33 cm = -0.33 m f = 1/f f = 1/-0.33 f = -3.03, rounded to -3.00
-3.00
Next
-4 m
Flip
How to solve: -4 m - you do not need to convert the measurement f = 1/f f = 1/-4 f = -0.25
-0.25
Next
-5.5 cm
Flip
How to solve: -5.5 cm - you need to convert the measurement -5.5 cm = -0.055 m f = 1/f f = 1/-0.055 f = -18.18, rounded to -18.25
-18.25
Next
-0.15 m
Flip
How to solve: -0.15 m - you do not need to convert the measurement f = 1/f f = 1/-0.15 f = -6.66, rounded to -6.75
-6.75
Next
0.210 m
Flip
How to solve: 0.210 m - you do not need to convert the measurement f = 1/f f = 1/0.210 f = 4.76, rounded to 4.75
+4.75
Next
44.0 cm
Flip
How to solve: 44.0 cm - you need to convert the measurement 44 cm = 0.44 m f = 1/f f = 1/0.44 f = 2.27, rounded to 2.25
+2.25
Next
80.0 cm
Flip
How to solve: 80.0 cm - you need to convert the measurement 80 cm = 0.8 m f = 1/f f = 1/0.8 f = 1.25
+1.25
Next
0.125 m
Flip
How to solve: 0.125 m - you do not need to convert the measurement f = 1/f f = 1/0.125 f = 8.00
+8.00
Next
62.0 mm
Flip
How to solve: 62.0 mm - you need to convert the measurement 62 mm = 0.062 m f = 1/f f = 1/0.062 f = 16.12, rounded to 16.00
+16.00
Next
End of the activity!
Great job!
Again
Focal Length
Venus Sosa
Created on October 15, 2025
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Transcript
focal length flipcards
Calculate the lens power of the shown focal lengths. Round each power to the nearest quarter diopter. Flip the card to reveal the answers!
Next Page
-0.20 m
Flip
How to solve: -0.20 m - you do not need to convert the measurement f = 1/f f = 1/-0.20 f = -5.00
-5.00
Next
-33 cm
Flip
How to solve: -33 cm - you need to convert the measurement -33 cm = -0.33 m f = 1/f f = 1/-0.33 f = -3.03, rounded to -3.00
-3.00
Next
-4 m
Flip
How to solve: -4 m - you do not need to convert the measurement f = 1/f f = 1/-4 f = -0.25
-0.25
Next
-5.5 cm
Flip
How to solve: -5.5 cm - you need to convert the measurement -5.5 cm = -0.055 m f = 1/f f = 1/-0.055 f = -18.18, rounded to -18.25
-18.25
Next
-0.15 m
Flip
How to solve: -0.15 m - you do not need to convert the measurement f = 1/f f = 1/-0.15 f = -6.66, rounded to -6.75
-6.75
Next
0.210 m
Flip
How to solve: 0.210 m - you do not need to convert the measurement f = 1/f f = 1/0.210 f = 4.76, rounded to 4.75
+4.75
Next
44.0 cm
Flip
How to solve: 44.0 cm - you need to convert the measurement 44 cm = 0.44 m f = 1/f f = 1/0.44 f = 2.27, rounded to 2.25
+2.25
Next
80.0 cm
Flip
How to solve: 80.0 cm - you need to convert the measurement 80 cm = 0.8 m f = 1/f f = 1/0.8 f = 1.25
+1.25
Next
0.125 m
Flip
How to solve: 0.125 m - you do not need to convert the measurement f = 1/f f = 1/0.125 f = 8.00
+8.00
Next
62.0 mm
Flip
How to solve: 62.0 mm - you need to convert the measurement 62 mm = 0.062 m f = 1/f f = 1/0.062 f = 16.12, rounded to 16.00
+16.00
Next
End of the activity!
Great job!
Again