is the emergent and incident ray angle equal in all triangular prism as well as the 2 angle of refraction all times or not necessarily at all? can someone help me aid with this confusion of mine.

Question

Note: it was using the olabs simulation by amrita university which has very much inaccuracy of its protractor in the simulation

Answer 1

This happens only at angel of minimum deviation, which is different for different colors.

For angle of minimum deviation setting ( Angle of incidence = angle of emergence, deviation angle is minimum)

µ = Sin (A+D/2) / Sin A/2

Where A = Angle of prism ( Generally 60⁰ )

and D = Angle of Minimum Deviation for particular color, For Example if A= 60⁰ , D = 45 ⁰ 9 For blue light )

µ ( for particular color of light ) = Sin ( 60 + 45)/2 / Sin A/2 = Sin 105/2 / Sin 60/2= Sin 52.5 / Sin 30

= 2*0.7933 = 1.586 ( for blue light )

For Red color of light D will be smaller than 45 ( Say 40 ⁰ )

µ ( For Red light ) = Sin 50/sin 30 = 1.53