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$)=(1\mathrm{.}5$

a$)$ Looking at the drawing above, can total internal reflection $($TIR$)$ happen for this incident ray? $($Note the $n$ values.$)($Circle one choice$)$

i$)$ yes, for any value of the angle ${}_1.$

ii$)$ yes, but only if ${}_1$ is larger than the critical angle.

iii$)$ no$,$ not for any value of the angle ${}_1.$

b$)$ Now look at the drawing below. A light ray has refracted from one medium to another. Note the subscripts on the indices of refraction $(n).$ Circle the one correct choice:

i$)n_1=n_2$

ii$)n_1$ is greater than $n_2$

iii$)n_1$ is less than $n_2$

iv$)$ more info is needed in order to com