= 313 μ λ = 760 μ; N313 = 2,5254. (Peter, 1923) .

(, 1955).

; (Rama.chandran, 1950; Denning et al, 1957; Schmidt et al., 1968). . 12.

R, R = (n 1)2 / (n + 1)2. , , n = 2,417, (λ = 589,3), 0,172. , 17,2% .

, . , ,