Question

Critical angle is the angle of $\underset{–}{}$ in denser medium for which the angle of $\underset{–}{}$ in rarer medium is $\underset{–}{}$.

• A. incidence, incidence, ${90}^o$
• B. refraction, refraction, ${90}^o$
• C. incidence, refraction, ${90}^o$
• D. refraction, incidence, ${90}^o$

Answer 1

The correct option is C incidence, refraction, ${90}^o$

Critical angle, by definition, is the angle of incidence in denser medium for which the angle of refraction in rarer medium is ${90}^o$.