Answer:
The Brewster angle, denoted as θB, is the angle of incidence at which light is reflected from a surface with no polarization. It is related to the refractive indices of the two media involved.
To find the Brewster angle when light is reflected from a plastic plate submerged in ethyl alcohol, we can use the formula:
tan(θB) = n2 / n1
Where n1 is the refractive index of the medium from which the light is coming (in this case, air) and n2 is the refractive index of the medium to which the light is incident (in this case, ethyl alcohol).
Given that n1 = 1 (approximately) and n2 = 1.362, we can substitute these values into the formula:
tan(θB) = 1.362 / 1
tan(θB) = 1.362
To find the value of θB, we can take the inverse tangent (arctan) of both sides of the equation:
θB = arctan(1.362)
Using a calculator, we find that the Brewster angle when light is reflected from a plastic plate submerged in ethyl alcohol is approximately 52.8 degrees.
Explanation: