When reading the printout from a laser printer, you are actually looking at an array of tiny dots. If the pupil of your eye is 4.2 mm in diameter when reading a page held 29 cm from your eye, what is the minimum separation of adjacent dots that can be resolved? (Assume light with a wavelength of 500 nm , and use 1.36 as the index of refraction for the interior of the eye.)
Express your answer using two significant figures.

Currents in dc transmission lines can be 100 a or higher. some people are concerned that the electromagnetic fields from such lines near their homes could pose health dangers. for a line that has current 150 a and a height of 8.0 m above the ground, what magnetic field does the line produce at ground level? express your answer in teslas and as a percentage of the earth’s magnetic field, which is 0.50 g. is this value cause for worry?