Part A A beam of light passes from glass with refractive index 1.62 into water w

Question

Part A

A beam of light passes from glass with refractive index 1.62 into water with a refractive index 1.29. The angle of the refracted ray in water is 56.0 . Find the angle of incidence.

Part B

Choose a sketch of the situation showing the interface between the media, the normal line, the incident ray, the reflected ray, and the refracted ray below.

Choose a sketch of the situation showing the interface between the media, the normal line, the incident ray, the reflected ray, and the refracted ray below.

Explanation / Answer

A)
given

theta_r = 56 degrees

n1 = 1.62

n2 = 1.29

theta_i = ?

Apply Snell's law

sin(theta_i)/sin(theta_r) = n2/n1

sin(theta_i) = sin(56)*1.29/1.62

sin(theta_i) = 0.66

theta_i = sin^-1(0.66)

= 41.3 degrees <<<<<<<<<<<<------------Answer

B) middle figure is the correct one.

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