Imagine that a tank is filled with water. the height of liquid column is 7 meters and the area is 1.5 square meters (m2). what's the force of gravity acting on the column of water?

-- The volume of water is    (1.5 m² x 7 m)  =  10.5 m³

   10.5 m³  =  10,500 liters

   Water mass  =  (10,500 liters) x (1 kg/liter) = 10,500 kg.

-- "Force of gravity on the water"

    =  Weight of the water = (10,500 kg) x (9.8 m/s²) = 102,900 newtons

-- Pressure on the bottom of the tank =

                 (102,900 newtons) / (1.5 m²)

             =      68,600 nt/m²  =  68,600 pascal .

Ihope you find the answer

  concave means having an outline or surface that curves inward like the interior of a circle or sphere. so the mirror curves inward.