- #1

Vitani11

- 275

- 3

## Homework Statement

Imagine a life guard situated a distance d1 from the water. He sees a swimmer in distress a distance L to his left and distance d2 from the shore. Given that his speed on land and water are v1 and v2 respectively, with v1 > v2, what trajectory should he choose to get to the swimmer in the least time? Pick some trajectory composed of two straight line segments in each medium (why?) and give a relation for the angles of the two segments with respect to the normal to the shoreline.

## Homework Equations

Ha

## The Attempt at a Solution

Should I include the diffraction of water, or should I not because this is a human? I'm assuming that I should use diffraction of water and so the corresponding optics equations because of the implication by "..some trajectory composed of two straight lines in each medium". If I didn't include diffraction, the angle wouldn't change, it would just be a straight line all the way through?