Lab+8+Lenses

= = =**EXERCISE 1: CONVERGING AND DIVERGING LENSES**=  1. Place the lens on the optical axis. The two points are its focal points. == 2. See how parallel light focuses at a point. This shows what happens when the curvature of the lens changes. **Object with a concave lens**  3. what happens when a source is put at the focal point of the lens. A source of light at the focal point of a convex lens will transmit a beam of parallel light. Some spotlights have a light bulb at the focal point of the lens. **Object with a convex lens**   4. Experiment with creating images with a lens. A convex lens can create a real image that will project on a screen or on the film of a camera. **Real Image**  5. Experiment creating virtual images with a lens. It can also create a virtual image like seen in a magnifying glass. **Virtual Image**   6. Experiment with a concave lens. Concave lenses are primarily used in eyeglasses for people who are nearsighted. ==

=**EXERCISE 2: THE HUMAN EYE**= Nearsighted

Corrected Farsighted Lens in eye is diverging because they are waves that are transmited through a slit in the eye. For more info click Here It is important because the focal point of the eye wear has to stay with in the range of the focal point of your eye. If they slide down then you can not see. = =
 * 1. Is the lens in your eye a converging or diverging lens? **
 * 2. Why is it important that glasses don't slide down the nose? **