- #1

famematt

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Hello,

I am doing a practice exam for i have exams coming up soon. The problem is as follows :)

An observer standing on the edge of the pool views a coin on the bottom of a swimming pool.

The observers eyes are 1.50 m above the pool and she sees the coin by looking at a point from 2m from where she is standing.

The refractive index of the pool water relative to air is 1.35 and the pool is 1.50 m deep.

(1) Find the angle of rarefaction.

(a diagram is attached)

Well, basically, the answer sheet says that the angle is 90 - tan

But the 2m is the distance is from the person to the coin, not the person to the normal, is it not?

Can someone confirm to me that I am either understanding the question incorrectly or the answer in the book is wrong?

Thanks,

Matt

I am doing a practice exam for i have exams coming up soon. The problem is as follows :)

## Homework Statement

An observer standing on the edge of the pool views a coin on the bottom of a swimming pool.

The observers eyes are 1.50 m above the pool and she sees the coin by looking at a point from 2m from where she is standing.

The refractive index of the pool water relative to air is 1.35 and the pool is 1.50 m deep.

(1) Find the angle of rarefaction.

(a diagram is attached)

## Homework Equations

Well, basically, the answer sheet says that the angle is 90 - tan

^{-1}(1.5/2)But the 2m is the distance is from the person to the coin, not the person to the normal, is it not?

Can someone confirm to me that I am either understanding the question incorrectly or the answer in the book is wrong?

Thanks,

Matt