A girl sees through a circular glass slab (refractive index 1.5) of thickness 20 mm and diameter 60 cm to the bottom of a swimming pool. Refractive index of water is 1.33. The bottom surface of the slab is in contact with the water surface.
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The depth of swimming pool is 6m. The area of bottom of swimming pool that can be seen through the slab is approximately -
(A) 100 m2
(B) 160 m2
(C) 190 m2
(D) 220 m2