A cylinder of radius R and height H and density ρC is floating upright in water and a portion remains above the waterline. The density of water is ρ. What fraction of the cylinder is below the water line? Derive an expression for the difference between the pressure at the cylinder’s lower (submerged) surface and atmospheric pressure.

I'm having some difficulty seeing the diagram clearly.but the question says there's a net inward force on the object.so we know right away,  from newton's 2nd law of motion, thatthat baby is accelerating.  it doesn't even matter which way thenet force is pointing.  if there's any net force, then either theobject's speed or else its direction must be changing.

Ray 2 should cross through the focal point on the right side of the lens.

This question is incomplete and not physics but i'm  willing to if you can give a better question