in the figure, light is incident at angle on a boundary between two transparent materials. some of the light travels down through the next three layers of transparent materials, while some of it reflects upward and then escapes into the air.

(a) θ5 in the air is 56.9° and (b) θ4 in the bottom material 35.30°. Normally, a light beam that strikes an angle on a prism's refracting face emerges from the opposite face.

How to calculate?

(a) Approximating n=1 for air, we have

n1. sinθ1 = (1)sinθ5 ⇒56.9°=θ5

and with the more accurate value for n air in Table below, we obtain 56.80.(b) Equation n1 sinθ c =n2 sin 90° leads to,

n1 sinθ 1=n2 sinθ2 =n3 sinθ 3 =n4 sinθ 4

so that. θ4 =sin −1( n1/n4.sinθ 1 )=35.30° .

What does angle of incidence mean?

The angle of incidence is formed by a line drawn perpendicular to the reflecting barrier and the wave's direction of motion.

Is the incidence angle of refraction?

Refraction Depending on the Refractive Indices in the Two Media and the Angle of Incidence. Snell's law states that the angle of incidence, I and the proportion of the refractive indices of the two media that make up the interface determine the angle of refraction, r.

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