A ray of yellow light crosses the boundary between glass and air, going from the glass into air. If the angle of incidence is 25°, what is the angle of refraction? (Assume that the index of refraction of glass is 1.5.)
Using Snell's law,
n1sinθ1 = n2sinθ2
θ1 and θ2 are the angle of incidence and angle of refraction.
The light travels from glass into air
n1 = 1.5, n2 = 1
θ1 = 25o.
1.5 sin(25) = 1 x sin(θ2)
sin(θ2) = 0.634
θ2 = sin-1(0.634)
= 39.34o.
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