Is concave lens the same as divergent lens


Time:

2022-12-13

A concave lens is not necessarily a divergent lens. The rays that enter the divergent lens parallel to its axis diverge, and all rays seem to originate from its focus F. But the dotted line is not light, but indicates the direction of light. The focal length f of the diverging lens is negative.

A concave lens is not necessarily a divergent lens.
The rays that enter the divergent lens parallel to its axis diverge, and all rays seem to originate from its focus F. But the dotted line is not light, but indicates the direction of light. The focal length f of the diverging lens is negative.
A concave lens is a divergent lens because it bends (diverges) light from its axis. In this case, the shape of the lens shall be such that all rays incident parallel to its axis appear to come from the same point F, which is defined as the focus of the divergent lens. The distance from the lens center to the focus is again called the focal length f of the lens. Note that the focal length and refractive power of the diverging lens are defined as negative.
The concave lens has a divergent effect on the light. The concave lens effect can be simply understood as the outward divergent light. However, if the incident light is originally the converging light, and the degree of the concave lens divergent light is not as high as the degree of the light's original convergence, then the light emitted will still converge (but the degree of convergence will be reduced).