Fig. 5. (Color online) (a) This diagram illustrates the virtual prism (represented by the triangle) and demonstrates the minimum deviation angle (
δmin). It highlights that the incident and refracted angles on either side of the minimum deviation are equal, showing the symmetry in the light path. The light ray follows this path to form the lower boundary at
θ2 [Adapted from Ref.
4], (b) A diagram showing the variables set to mathematically prove the relationship between each distance and the angle of least convenience (Large circle radius
R, small circle radius
r, small circle refractive index
n).
