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(B) The critical angle $C$ is defined as the angle of incidence for which the angle of refraction is $90^o$. In the context of total internal reflecti

Vedclass · Accepted Answer

$90$

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(B) The critical angle $C$ is defined as the angle of incidence for which the angle of refraction is $90^o$. In the context of total internal reflection,when a ray is incident at the critical angle,the refracted ray grazes the surface of the medium,meaning the angle of refraction is $90^o$. However,the question states that a normally incident ray is reflected at an angle of $90^o$. This phrasing is physically ambiguous as normal incidence implies an angle of incidence of $0^o$. Given the standard interpretation of such problems where the grazing emergence occurs at the critical angle,the angle of refraction is $90^o$. Thus,the critical angle $C$ corresponds to the condition where the angle of refraction is $90^o$. Therefore,the value is $90^o$.

$A$ normally incident ray is reflected at an angle of $90^o$. The value of the critical angle is.......$^o$

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