A prism of refractive index μ and angle A is placed in the minimum deviation position. If the angle of minimum deviation is A, then the value of A in terms of μ is:
a. sin⁻¹ (μ/2)
b. sin⁻¹ √μ₋1/2
c. 2cos⁻¹(μ/2)
d. 2cos⁻¹(μ/8)