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From the diagram below,what is the angle between the incident ray and the reflected ray?

$\begin{array}{1 1}(A)\;20^{\large\circ}&(B)\;40^{\large\circ}\\(C)\;70^{\large\circ}&(D)\;90^{\large\circ}\end{array}$

the angle between the incident ray and the reflected ray is $40^{\large\circ}$
Hence (B) is the correct answer.