A curved surface area can be described as one where the gradient of the normal to the surface changes smoothly from point to point.
A surface having no equivalent point at any plane
A cone.
cornet
No prism can have a curved surface.
No but a cone has a curved surface
A sphere
A tangent
A curved surface of a lens can bend incoming light rays, focusing them to a point to form a clear image. The degree of curvature and the shape of the lens surface determine how the light is bent and where the focal point is located. This process is essential for the functioning of optical devices such as cameras, microscopes, and eyeglasses.
It is a point where one line (straight or curved) meets another line or a non-coplanar surface.
it is a three dimensional cone , the circle is the edge of the figure and the curved side is the body of the cone, the vertex is the point of the cone
A sphere has a total curved surface. A cylinder and a cone have a partial curved surface