Which statement describes a convex lens?
a: it is always made of glass.
b: it is thickest at the edged.
c: it absorbs most light.
d: it bends light rays inward.

A convex lens  is a type of optical lens that thicker in the center than at its edges and concentrates (converges) at a point the rays of light that pass through it.

In addition, its focal point is where parallel rays of light from the object meet, or converge. Nevertheless, it is important to note the object must be within the radius of curvature of the lens.

Therefore, a convex lens  bends light rays inward, making them converge at a point where the image is formed, and  the correct option is D.

it is a negative acceleration

initial speed when it is dropped is 150 ft/s

now at the same moment the acceleration due to gravity is perpendicular to its velocity

so as we know that

now we have centripetal acceleration a = 32 ft/s^2 as its perpendicular to velocity

while tangential acceleration at the same moment will be zero

so

now radius of curvature is given as

so the radius of curvature just after it is dropped is 703.125 ft