Tricky(?) Crocodile Maths Exam Question

[Thomas Klemm]

(10-09-2015 04:07 PM)peacecalc Wrote:  It is the mechanical analogy of snell's law in optics, both have the same solution.

In this degenerated case for the critical angle we have:
\[
\sin \theta=\frac{v_1}{v_2}=\frac{4}{5}
\]
Assuming that the width of the river is \(d=6\) we get:
\[
x = d \tan \theta
\]

Calculation
4 ENTER
5 /
ASIN
TAN
6 *
8.0000

Cheers
Thomas