The ratio of reflected intensity to the incident intensity at normal incident from medium having refractive index ni t0 n 18 4n,n (n 7n) (a) (( + ng) (b) (n-n,)

The ratio of reflected intensity to the incident intensity at normal incident from medium having refractive index ni t0 n 18 4n,n (n 7n) (A) (( + ng) (B) (n-n,) (n+n,) 4n, (D) (+n) (C) (n-n2))