CBSE Class 12-science Answered
critical angle in case of bending light by 90 or 180 degree must be less than 45 degree. why?
Asked by akankshyasahu | 25 Apr, 2011, 06:17: PM
Expert Answer
According to Snell's law we know that
where is the angle formed by incident ray with the normal and 
is the angle formed by the refracted ray with the normal
is the angle formed by the refracted ray with the normal
is the refractive index of the medium 2 and 
And according to snell's law the critical angle is only defined when 
is less than 1
is less than 1Therefore critical angle in case of bending light by 90 or 180 degree must be less than 45 degree because if it is 45 degree then will be equal to 1 , so it wont satisfy the snell's law.
will be equal to 1 , so it wont satisfy the snell's law.
Answered by | 30 Apr, 2011, 11:35: AM
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