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The above statement states that when the minimal angle of departure is 29 degrees, then index of refraction is 1.26.
Refraction occurs when light bends or changes direction as it passes through one material and then another. For instance, when light strikes water after passing through the air, it refracts. As a result, the straw in a water glass may appear bent at the water's surface. Some surfaces don't refract or reflect light at all.
D=29°
As for the refractive index:
μ=2sin(30°+D/2)
=2sin(30°+29°/2)
=2sin(30°+14.5°)
=2sin(44.5°)
=2*0.63
= 1.26
Therefore the refractive index is 1.26.
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