[flflaa]

ممكن حد يحل المسأله دى


الرابط ده the fig.

http://www4.0zz0.com/2008/10/25/12/369737315.jpg

in the figer , A hollow prism a ray full perpendicular to one side
trace the light ray and find the angle of emergance
given that : Nglass = 1.5