| We saw in the last section that a real image is formed by light moving through a convex lens. |
| A double convex lens with a focal length of 50 cm is fixed in a PVC pipe about 60 cm long. |
| Photograph by Allan Mills of a rectangular grid of lines on a white board, taken using a simple convex lens. |
| The bull's-eye lantern has a convex lens which concentrates the light and allows it to be thrown in the shape of a diverging cone. |
| Powerful images captured through a convex lens are frozen in time. |
| This will give a negative focal length for a convex lens of air inside water. |
