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A fish is near the centre of a spherical...

A fish is near the centre of a spherical water filled(`mu=4//3`)fish bowl,A child stands in air ata distance `2R`(R`is the radius of curvature of the sphere)from the centre of the bowl.At what distance from the centre would the child nose appear to the fish situated at the centrer:

A

4R

B

2R

C

3R

D

4R

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