Please prove the equations only

n1=1.0 Incident ray '\\ The ray emerging from the block is parallel to the incident ray, but displaced from it by a distance d, which you can prove to be given by d = tsin1(l:$+$';) where .t is the width of the block and ll and (D2 are the angles of incidence and refraction, respectively, at the refracting surface. Predict d by measuring the angles on your drawing and using the equation; also determine (2' by measuring it directly. Calculate the relative deviation from the prediction. Prove the above equation. Hint: sin (a :t b) = sin (a) cos (b) :1: cos (a) sin {b}