Tuesday, 26 September 2017

CRITICAL ANGLE

When a ray of light enters from a denser medium to a rarer medium, its some part is reflected and most of  part is refracted. in this condition, the angle of refraction is greater than angle of incidence.

As the angle of incidence  gradually increased the corresponding angle of refraction also increases. At a certain angle of incidence the angle of refraction becomes 90*. This angle of incidence is called the "CRITICAL ANGLE" for the given pair of media. 

"critical angle is the angle of incidence in the denser medium corresponding to which the angle of refraction in the rarer medium is 90*" It is denoted by C. 

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