Wavelength,

λ nm

n_f

(Φ = 60˚)

n_f

(Φ = 65˚)

n_f

(Φ = 70˚)

400

1.6440

1.6566

1.6466

500

1.6125

1.6289

1.6489

600

1.5975

1.6134

1.5934

700

1.5890

1.5915

1.5899

800

1.5834

1.5945

1.5802