Lenses. Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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Lenses. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

You have, of course, seen various glasses, as well as loupes, or magnifying glasses. All of them are lenses. When examining near or far objects through them, directing light, for example from the sun or a lamp, onto a screen, such as a board, you probably noticed some features of the lenses. Depending on the shape of the surfaces (convexity, concavity), each lens refracts rays differently and produces images of different sizes. In optics, lenses are transparent, polished bodies (most often made of glass), bounded by curved (most often spherical) surfaces.

Lenses

An imaginary line passing through the centers of the spherical surfaces is called the optical axis of the lens.

If the middle of the lens is thicker than the edge, then rays parallel to the axis, coming from a sufficiently distant object, can be received on the screen and combined at one point. This point is called the main focus. Such lenses will be called positive, or converging. More than once, of course, you have used a magnifying glass as a burning glass for burning patterns on a tree.

Lenses, in which the middle is thinner than the edge, always give a divergent beam of rays. Such lenses are called negative, or divergent. In a diverging lens, the focus is imaginary. It cannot be taken to the screen. The distance from the focus of the lens to the center of the lens is called the focal length.

Lenses

Having studied the properties of lenses and the eye, man has built perfect optical instruments - microscopes, telescopes, periscopes, cinemas and cameras.

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