- #1

Cocoleia

- 295

- 4

## Homework Statement

I am given the following figure:

These are converging rays that appear to be going to a point F convert to a plane wave upon hitting the boundary between n2 and n1, and I am asked to find the equation for the boundary between n1 and n2 that perfectly accomplishes this conversion to a plane wave. Assume the distance between the vertex of the boundary and the point F is a known quantity.

## Homework Equations

## The Attempt at a Solution

I believe the answer is 1/f = 1/n1 + 1/n2

But I am not sure how to get to this answer. Could someone please explain the steps and help me understand the problem? Thanks.