In the Snellen visual acuity chart, the letters in the 20/40 line subtend an angle of 3 milliradians with respect to the eye when viewed at a distance of 6 meters ( i.e., approximately 20 feet ). Using the small-angle approximation, calculate the actual height of the 20/40 letter, in units of mm?
In the Snellen visual acuity chart, the letters in the 20/40 line subtend an angle of 3 milliradians with respect to the eye when viewed at a distance of 6 meters ( i.e., approximately 20 feet ). Using the small-angle approximation, calculate the actual height of the 20/40 letter, in units of mm?
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In the Snellen visual acuity chart, the letters in the 20/40 line subtend an angle of 3 milliradians with respect to the eye when viewed at a distance of 6 meters ( i.e., approximately 20 feet ). Using the small-angle approximation, calculate the actual height of the 20/40 letter, in units of mm?
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