In this problem, let's consider a path r joining two points A and B.

The length of the optical path is defined by the line integral:

$\overline{){\mathbf{l}}{\mathbf{=}}{{\mathbf{\int}}}_{{\mathbf{r}}}{\mathbf{n}}{\mathbf{d}}{\mathbf{s}}}$.

In this case, n is the refractive index and ds is the differential element of length.

Light will almost always travel from one place to another along a path of least

A. distance.

B. time.

C. effort.

D. expense.

E. complication.

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Refraction Of Light concept. You can view video lessons to learn Refraction Of Light. Or if you need more Refraction Of Light practice, you can also practice Refraction Of Light practice problems.