In a concave lens, the focal length is considered to be: (2023)

In a concave lens, the focal length is considered to be: (2023)

Step 1: Understand what a concave lens is. A concave lens is thinner in the middle and thicker at the edges.
Step 2: Know that a lens can bend light. A concave lens diverges (spreads out) light rays that pass through it.
Step 3: Learn about focal length. Focal length is the distance from the lens to the point where light rays meet (focus).
Step 4: Realize that for concave lenses, the light rays do not actually meet; they appear to come from a point behind the lens.
Step 5: Understand the convention used in optics. By convention, the focal length of a concave lens is assigned a negative value.
Step 6: Conclude that since a concave lens diverges light rays, its focal length is considered negative.

No concepts available.