At the battle of Bunker Hill, the American troops were reportedly ordered not to

Question

At the battle of Bunker Hill, the American troops were reportedly ordered not to open fire until they could see the whites of the enemy soldiers' eyes. If the white of an eye is 1 cm in diameter, the pupil is 5 mm in diameter, and the typical wavelength of visible light is 500 nm, at what distance were the Americans supposed to fire? ___________The answer is 82m. How do you get this?
At the battle of Bunker Hill, the American troops were reportedly ordered not to open fire until they could see the whites of the enemy soldiers' eyes. If the white of an eye is 1 cm in diameter, the pupil is 5 mm in diameter, and the typical wavelength of visible light is 500 nm, at what distance were the Americans supposed to fire? ___________The answer is 82m. How do you get this?

Explanation / Answer

Apply s/r = 1.22(wavelength)/D

.01/r = (1.22)(500 X 10^-9)/(5 X 10^-3)

r = 82.0 m

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