The critical angle is the angle of incidence for which the angle of refraction is 90°.When a ray of light passes from a denser medium into a rarer medium, it bends away from the normal. As you increase the angle of incidence, the angle of refraction increases. At the critical angle, the refracted light grazes the boundary of the two mediums, creating a 90° angle of refraction. If the angle of incidence exceeds this threshold, the light will undergo total internal reflection instead of refracting.
The critical angle is such angle of incidence for which angle of refraction is …………
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