Its a derivation, it involves pure algerba especially in this case. The only way( i know at least) to derive equations is through substituting and eliminating certain variables.
And the attempts I've made are just trying plug stuff into 1 equations try to eliminate and so forth. It takes me...
Trying to relate Equation 4.6, 4.7, 4.8 from here: [PLAIN]http://physics.nmt.edu/~raymond/classes/ph13xbook/node35.html[/URL]
Basically trying to relate the deviation angle, incident angle, refractive index and apex angle.
2. The equations are in the link.
3. My attempts are less than fit to...