Contour Lines.
A perceived line that marks the edge of a figure as it curves back into space. Contour lines are created by the edges of things. Contour lines are lines that surround and define the edges of a subject, giving it shape and volume
The diaphragm is another term for the aperture, so it controls the amount of light passing into the film camera.
You didn’t attach an image!!
Mass, in general use is the weight. Whereas depth is the distance from a surface to the bottom.
