Exercice 5. Un prisme de verre de section principale ABC rectangle en B dont l'angle au sommet est A = 75° est
placé dans l'air. Un rayon monochromatique pour lequel le verre a pour indice n= 1,6328 arrive en
I sur la face AB sous l'incidence i au-dessous de la normale. Rappeler la condition sur l'angle i pour
que le rayon émerge par la face AC.

Afisherman notices that his boat is moving up and down periodically without any horizontal motion, owing to waves on the surface of the water. it takes a time of 2.20 s for the boat to travel from its highest point to its lowest, a total distance of 0.670 m . the fisherman sees that the wave crests are spaced a horizontal distance of 5.80 m apart. (a) how much is the wavelength? (b) find the period of the wave. (c) how fast are the waves traveling? (d) what is the amplitude a of each wave?