Southernland16
25.09.2021 •
Physics
A ray of light passes from glass into air at an angle of incidence of 40 degrees. The
glass has a critical angle of 42 degrees. Which diagram shows what happened to the
ray?
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Ответ:
A is correct
Refracted light is almost along the x-axis
Ni sin thetai = Nr sin thetar
In this case thetai is the incident angle and thetar the refracted angle
At the critical angle thetar = 90 deg and
1 = Ni sin thetai since Nr is the refractive index of air
Ni = 1 / sin 42 = giving Ni = 1.49 for the glass
Ответ: