A glass sphere of radius 20cm has a small air bubble 4cm below its centre. The sphere is viewed from outside and along a vertical line through the bubble. The apparent depth of the bubble below the surface of sphere is

A glass sphere of radius 20cm has a small air bubble 4cm below its cen

1.	A glass sphere of radius 20cm has a small air bubble 4cm below its centre. The sphere is viewed from outside and along a vertical line through the bubble. The apparent depth of the bubble below the surface of sphere is
Answer» 13.33 26.67 15 30 Answer :B