what is a critical angle
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☆CRITICAL ANGLE
•The angle at which the incident ray after refraction grazes (i.e; makes 90° with the normal) is called the critical angle. Any ray incident at an angle greater than the critical angle undergoes total internal reflection.
☆CRITICAL ANGLE
•The angle at which the incident ray after refraction grazes (i.e; makes 90° with the normal) is called the critical angle. Any ray incident at an angle greater than the critical angle undergoes total internal reflection.
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A particular value of i the value of r becomes equal to 90degree. This value of i is called the critical angle.
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