Final answer:
The viewing angle of the screen can be expressed as a function of the distance from the wall using the equation atan(y/x).
Step-by-step explanation:
The viewing angle of the screen can be expressed as a function of the distance from the wall in the following way:
viewing angle = atan(y/x)
Where y represents the distance along the screen and x represents the distance from the wall. This equation uses the tangent function to calculate the viewing angle in radians.
By plugging in different values for y and x, you can find the corresponding viewing angles for different positions on the screen.