A concave mirror is placed at the bottom...

A concave mirror is placed at the bottom of an empty tank with face upwards and axis vertical. When sunlight falls normally on the mirror, it is focussed at distance of `32cm` from the mirror. If the tank filled with water `(mu=4//3)` up to a height of `20cm`, then the sunlight will now get focussed at

16 cm above water level

9 cm above water level

24 cm below water level

9 cm below water level

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