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## Homework Statement

I am preparing for a test. I really need help with this is problem. I uploaded a picture for the figure.

The figure below shows the path of a beam of light through several layers (n1 = 1.58, n2 = 1.39, n3 = 1.21 and n4 = 1.00) of different indices of refraction.

PART1 ASKS:

If

PART 2:

What must the incident angle,

## Homework Equations

We have to use Snell's Law: which is n1sin=n2sin

## The Attempt at a Solution

FOR PART 1: This is what I did:

I know N for 1 and 2. The angle is 29.1 as given. So....

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For Part 2: I am clueless.

Please guide me.