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Meredith dug her cell phone out of her pocket and looked at it. “What about the lens in this? I can’t add new ones on to it like you can with that old camera.” “Actually you can add a new and different lens to a cell phone camera. There are kits you can buy that have wide-angle and telephoto lenses. They just are considerably smaller than these.” “I hate to admit it, Colin, but you seem to know a lot about this stuff,” Meredith said, smiling. “Gee, thanks. Never thought I’d hear you say that!”

Lenses If you wear eyeglasses or contact lenses, then you are familiar with lenses and how they focus light and images. Convex lenses are used to correct some vision problems, such as with the contact lenses pictured, and are also found in magnifying glasses. Concave lenses are used in door peepholes to provide the person inside with a wide-angle view of the hallway. Concave and convex lenses are used together for other instruments including telescopes, binoculars, and cameras.

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