BBC2 年
Convex and concave lenses
In a ray diagram, a concave lens is drawn as a vertical line with inward facing arrows to indicate the shape of the lens.
BBC2 年
Convex and concave lenses
In a ray diagram, a concave lens is drawn as a vertical line with inward facing arrows to indicate the shape of the lens.
PBS3 年
Two Types of Telescopes
Instead of a concave lens near the eye ... they could cause the red and blue ends of the spectrum to converge towards a single focal point, thereby solving the color-fringe problem.