what is critical angle? who it is related with refractive index?
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It refers to incident angle which when project to a denser surface produces an refraction angle of 90 degrees
Ic = Critical angle = sin ^-1 (n21)
where n21 = refractive index of denser medium / refractive index of rarer medium
hina261:
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The critical angle is that angle at which, if a ray is incident while passing from a denser to a rarer medium, the angle of refraction is. ⇒ sin i c r sin 90 o = 1 μ where, is the critical angle, and, is the refractive index for a ray passing from the rarer to the denser medium.
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