Question

Imagine that you are standing in the shallow end of a swimming pool, you look ahead at the bottom of the pool and see a coin, Describe the difference between where the coin appears to be and where it actually is.

a clear plastic cube, with exactly the same index of refraction as water is placed in a container of water, would you be able to see the plastic cube in the water if you looked at it from an angle explain why or why not

i need help understanding

Answer 1

Google Snell's law. They always show that particular picture :) Perhaps google spear fishing as well

in the second question, something with the same color and index of refraction does not bend or reflect or anything and is invisible.

Answer 2

http://sciencelearn.org.nz/Contexts/Light-and-Sight/Teaching-and-Learning-Approaches/Investigating-refraction-and-spearfishing