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In the figure, light initially in material 1 refracts into material 2, crosses that material, and is then incident at the critical
angle on the interface between materials 2 and 3. The indices of refraction are n, =
What is angle 0? (b) If 0 is increased, is there refraction of light into material 3?
1.60, n2
1.40, n3 =
1.18. (а)
%3D
le
n2
(a) Number
Units
(b)

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