Final answer:
The angle, θ, can be determined using Snell's law with the refractive indices of air and plastic. The angle is approximately 48.19°.
Step-by-step explanation:
When ray of light travels through transparent plastic to air.
The ray of light enters the air travelling parallel to the surface of the plastic.
The refractive index of the plastic is 1.25.The angle, θ, can be determined using the formula for the angle of refraction, which is given by Snell's law:
θ = sin-1((n1/n2))
In this case, n1 represents the refractive index of the air (which is 1.00) and n2 represents the refractive index of the plastic (which is 1.25).
Substituting these values into the formula, we get:
θ = sin-1((1.00/1.25))
θ ≈ 48.19°