1.   Many animals have a single lens used to focus light on to a plate able to convert it into nerve impulses.

2.   The technique involves the use of a micro-beam of electrons which are focused on the sample surface using electrostatic lenses.

3.   But does Dr. Bowling use the lens herself?

4.   His eyeglasses snap open at the point where the temple meets the lens frame so that the same lenses can be used in several different frames.

5.   If van Eyck had used the lens in a camera obscura, he would have had to paint upside-down, Stork said.

6.   In both, a special wide-angle lens was used.

7.   It uses ordinary lenses to focus laser light to the smallest possible spot on a very thin slice of the sample.

8.   Later on, he hides a gun inside one, using the lens as a barrel extension.

9.   Some systems use lenses to widen the beam so that even if the laser moves, the beam will still hit the receiver.

10.   The footage, shot using night lenses which make images look green, showed flashing lights and tracer fire.