We can parameterize the ray from $C$ through $P$ as a function of $t$:
$\qquad R(t) = (1-t)C + tP$
Using the graph below, find the value of $t^*$ such that $R(t^*) = I$.
$t^* =$ [[☃ numeric-input 1]]
[[☃ interaction 1]]
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