For example: when we put the light at an angle of 30 degrees in the air to the water we expected it to be 30 degrees and we were correct, the angle of incident equaled the angle of refraction. But.... the angle of the light that had passed into the water was a surprising 22 degrees not 30 degrees. So, we know that the light refracted and that the refracted light had a decreased angle, when compared to the vertical. If we changed the medium when the light was entering the glass, it would be reduced to 20. When we start at a higher density like water, it starts in 30 degrees and the light refracted is 40
For example: when we put the light at an angle of 30 degrees in the air to the water we expected it to be 30 degrees and we were correct, the angle of incident equaled the angle of refraction. But.... the angle of the light that had passed into the water was a surprising 22 degrees not 30 degrees. So, we know that the light refracted and that the refracted light had a decreased angle, when compared to the vertical. If we changed the medium when the light was entering the glass, it would be reduced to 20. When we start at a higher density like water, it starts in 30 degrees and the light refracted is 40