A hemispherical glass body of radius 10 cm and refractive index 1.5 is silvered on its curved surface . A small air bubble is 6 cm below the flat surface inside it along the axis. The position of the image of the air bubble made by the mirror is seen :
A. 16 cm below flat surface
B. 20 cm below flat surface
C. 30 cm below flat surface
D. 14 cm below flat surface