| A | B |
|---|
| concave lens | a lens that is thinner in the middle than it is at the edges and curves inward |
| convex lens | a lens that is thicker inthe middle than it is at the edges and curves outward |
| lens | a piece of glass or transparent material |
| transparent | material that sllows light to pass through so objects can be seen clearly |
| translucent | material that allows some light to pass through, but that doesn't allow objects on other side to be seen |
| opaque | material that does not allow light to pass through |
| spectrum | a band of colors into which white light is searated according to wavelength , by being passed throught a prism or other material |
| prism | an object of transparent material with three straigh faces at an angle to each other which refracts visible light |
| refraction | bending of waves when they change speed while passing from one material to another at an angle |
| image | a picture of an object when light rays from an object are focused by a lens or mirror |
