Using the hand measurement of angular deviation, 3 fingers represent ____ mils.

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Multiple Choice

Using the hand measurement of angular deviation, 3 fingers represent ____ mils.

Explanation:
Mils are a way to express small angles, and the hand method uses your own arm’s length as a quick ruler. When you hold your hand at arm’s length, the width of three fingers across the hand subtends a certain angle in your line of sight. If that width is about 6 cm and the distance to your eye is roughly 60 cm, the angle is width divided by distance: 0.06 m / 0.60 m ≈ 0.1 radians. Since 1 radian equals 1000 mils, 0.1 radians is about 100 mils. So three fingers at arm’s length roughly correspond to 100 mils. This is a practical, approximate method for estimating angular deviation in the field.

Mils are a way to express small angles, and the hand method uses your own arm’s length as a quick ruler. When you hold your hand at arm’s length, the width of three fingers across the hand subtends a certain angle in your line of sight. If that width is about 6 cm and the distance to your eye is roughly 60 cm, the angle is width divided by distance: 0.06 m / 0.60 m ≈ 0.1 radians. Since 1 radian equals 1000 mils, 0.1 radians is about 100 mils. So three fingers at arm’s length roughly correspond to 100 mils. This is a practical, approximate method for estimating angular deviation in the field.

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