As 25.4 mm = 1 in (exactly), divide by 25.4
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41 inches = 3.42 feet.
12 inches a foot, times 6 feet, is 72 inches.
hi/ho = di/do di = dohi/ho di = (51mm)(3.5mm)/(13mm) di = 14mm * rounded to 2 significant figures The image would be 14mm in front of the lens.
1 inch = 2.54 centimeters 1 foot = 12 inches = 30.48 centimeters 2 feet = 24 inches = 60.96 centimeters . . 6 feet = 182.88 centimeters
No.