which is unnecessary to include when accurately drawing ray diagrams?\n○ focal point\n○ lens\n○ focal…

which is unnecessary to include when accurately drawing ray diagrams?\n○ focal point\n○ lens\n○ focal length\n○ three easy rays

which is unnecessary to include when accurately drawing ray diagrams?\n○ focal point\n○ lens\n○ focal length\n○ three easy rays

Answer

Brief Explanations:

Ray diagrams in optics are used to understand the behavior of light passing through lenses. The focal point, lens, and three - easy rays (parallel ray, central ray, and focal ray) are essential elements. The focal length is a property related to the lens and focal point and is also crucial. However, while the focal length is important conceptually, it is not always necessary to explicitly include its numerical value when accurately drawing the ray diagram. The key elements are the relative positions and the paths of the rays with respect to the lens and focal point.

Answer:

focal length