- #1
A13235378
- 50
- 10
- Homework Statement
- When a ray of sunlight enters a drop of water, it undergoes multiple internal reflections accompanied by partial transmissions out of the drop. Consider an ABCDE ray that undergoes a single internal reflection before emerging from the drop (Figure). The primary rainbow is formed when the deviation θ is minimal. Show that this happens for an incidence angle θ1r such that
- Relevant Equations
- n1sen theta1 = n2 sen theta 2
I drew the red and green tangent lines and I found that the angles in blue are equal to theta 1. Also , as the BCD triangle is equilateral, theta 2 = 30. With this I can calculate the side of this equilateral triangle as a function of the radius R of the circumference. After that, I can't go on. My only problem is not the physical itself, but the geometry. How can I finish?
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