A solid plastic cylinder is placed in a liquid with refractive index $1.4$. Light in the plastic cylinder meets the inner surface at an angle of incidence of $70^{\circ}$. Total internal reflection occurs. What are the values of the critical angle in the plastic and the refractive index of the plastic?
- Acritical angle greater than $70^{\circ}$, refractive index greater than $1.4$
- Bcritical angle greater than $70^{\circ}$, refractive index less than $1.4$
- Ccritical angle less than $70^{\circ}$, refractive index greater than $1.4$
- Dcritical angle less than $70^{\circ}$, refractive index less than $1.4$