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## Homework Statement

Light of free space wavelength 600 nm (6000 Å) travels 1.6 10

-6

m in a medium of

index of refraction 1.5.

Find:

1. the optical path length, [This is the physical path length x refractive index.]

2. the wavelength in the medium, and

3. the phase difference after moving that distance, with respect to light travelling the

same distance in free space.

## Homework Equations

## The Attempt at a Solution

just for part 3 I got the right answer but Im just a little confused if my resoning is right.

the phase difference I calculated using d∏/λ I used Pi since the refractive index was not an integer so I thought it would be destructive intefeerence.

The answer comes out to be 8∏/3 but I am a little confused on why?