Microscope from a laser pointer. Drawing, description

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Microscope from a laser pointer. Children's Science Lab

Children's Science Lab

A very simple projection microscope can be built from a laser pointer and a medical syringe.

The principle of operation of this device is very simple - a monochrome laser beam passes through a drop of water, is refracted in it and projected onto a screen. All the contents of the drop in the form of shadows will be perfectly visible on the screen. The resulting magnification can reach 1000 times.

In this device, a medical syringe is needed in order to conveniently receive a drop of water at the tip of the needle.

Any pointer with a green beam will work as a laser, a blue laser is even better - the shorter the wavelength, the better the resolution will be. The laser with a red beam also works well. The laser power can be 5 mW, but it is better to take a more powerful laser pointer, then the image received on the screen will be much brighter.

Homemade microscope from a laser pointer and a drop of water

Laser pointer microscope
Rice. 1. Homemade microscope from a laser pointer

Figure 1 shows the complete device. Its basis is a wooden bar, to which three other bars are glued or screwed with screws - two small ones, holes are drilled into them, into which a laser pointer is inserted, and one large one, which serves as a tripod for a syringe. In the left bar that supports the laser, there is a nut into which the screw is screwed. This screw should be located exactly opposite the laser pointer power button, it serves as a power switch - when the screw is screwed in, it presses the pointer power button, allowing you to hold this button down for a long time.

Another wooden block is attached to a large bar, into the hole of which a syringe is inserted with little friction.

Instead of wooden bars, you can use pressed foam bars, in which case the inclusion unit will have to be made from a thick metal ring with a diameter slightly larger than the diameter of the pointer. A hole should be drilled in the ring and a thread cut in it, into which a screw will be screwed that presses the power button.

Image on the screen of a microscope made from a laser pointer

How to use a microscope.

Draw water from a swamp or an old puddle into a syringe - such reservoirs are full of all kinds of living creatures such as amoebas and ciliates. Insert the syringe into a tripod, squeeze out a little liquid so that a drop comes out at the end of the needle. Adjust the position of the syringe so that the laser beam passes exactly through the center of the water drop. Set up the microscope at a suitable distance from the screen (this distance depends on the laser power). Turn off the lights in the room. Figure 2 shows an example of what can be seen on the screen - moving amoebas in a drop of water taken from an old puddle.

Laser pointer microscope
Rice. 2. An example of what is seen on the screen in a microscope made from a laser pointer

Publication: the-mostly.ru

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