converging lenses![click to hear](/images/speaker.jpg)
Thicker in the center than on the edges; they cause parallel light rays emanating from an object to converge onto the same point.
plano-convex lens ![click to hear](/images/speaker.jpg)
Lens with one flat side and one convex side (bulging outward).
positive meniscus ![click to hear](/images/speaker.jpg)
Lens where the concave side (curving inward) is less pronounced than the convex side (bulging outward).
biconvex lens ![click to hear](/images/speaker.jpg)
Lens with both faces bulging outward.
convex lens ![click to hear](/images/speaker.jpg)
Lens with one side bulging outward; the greater the bulge, the more the light rays converge.