Pencils as rays. Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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Pencils as rays. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

For this experiment we will need: a small rectangular mirror and two long pencils. The experiment will illustrate one of the main laws of the doctrine of light - optics: the angle of reflection of the beam is equal to the angle of its incidence. It is only necessary to clarify that the angle of incidence and the angle of reflection mean the angles between the perpendicular lowered to the reflecting surface and the incident and reflected rays.

Lay a sheet of paper on the table and draw a straight line on it. Place a mirror on the paper perpendicular to the drawn line. To prevent the mirror from falling, place books behind it.

To check the strict perpendicularity of the line drawn on paper to the mirror, make sure that both this line and its reflection in the mirror are straight, without a break at the surface of the mirror. After all, if there were no mirror, the line would be completely straight, and when there is a mirror, a straight line should consist of a drawn and a reflected line. It was you and I who created the very perpendicular that was mentioned at the beginning.

Pencils will act as light rays in our experiment. Put the pencils on a piece of paper on opposite sides of the drawn line with the ends facing each other and to the point where the line rests against the mirror (see figure). Now make sure that the reflections of the pencils in the mirror and the pencils in front of the mirror form straight lines, without a break. One of the pencils will play the role of the incident beam, the other - the reflected beam. The angles between the pencils and the drawn perpendicular are equal to each other.

Pencils as rays

If now you rotate one of the pencils (for example, by increasing the angle of incidence), then you must also rotate the second pencil so that there is no break between the first pencil and its continuation in the mirror.

Every time you change the angle between one pencil and the perpendicular, you need to do this with another pencil so as not to disturb the straightness of the light beam that the pencil depicts.

Author: Rabiza F.V.

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