An aquarium filled with water has flat glass sides whose index of refraction is 1.54. A beam of light from outside the aquarium strikes the glass at a $43.5 ^\circ$ angle to the perpendicular (Fig. 23–56). What is the angle of this light ray when it enters
- the glass, and then
- the water?
- What would be the refracted angle if the ray entered the water directly?
Source: Giancoli, Douglas C., Physics: Principles with Applications, 7th Edition, 2014.