Laser pen can "micro" ?

Laser pen with a simple, convenient and affordable, in addition to help you lighting, self-defense, tour guides, it also has other effects. Recently, a netizen broke the news that with a laser pen to see the water in the micro-organisms, a small laser pen as much as the role of it? Today, JAC laboratory to take you to do this experiment, in the end the laser pen can not see the water micro-organisms? In order to ensure the authenticity of the experiment, the reporter conducted two groups of experiments.

Experimental site Jianghuai laboratory

Experimental sample of a glass of water, a glass of tap water

Experimental tool A laser pen, a syringe, a white cloth or white board and other items

Experiment procedure

1. First with a small amount of water to absorb the syringes, and then fixed to the syringe vertical, and then forced down a drop of water, so that the water droplets hanging in the bottom of the tube at the mouth.

2. Will be prepared in advance of the laser pointer on the water droplets, and projected onto the white cloth or whiteboard, this time to see, projected into the water image has a continuous swimming small objects.

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(Note: tap water experiment process above)

Experimental results

Successfully saw the stained microbes on the opposite white cloth, and the microbes in tap water were much less relative to the river.

Precautions

1. between the syringe and the projection of the white cloth to maintain a certain distance.

2. the laser pointer to collimate the beam, monochrome, and with the water droplets remain in the same horizontal line.

3. the best laboratory in the dark environment, to see clearly.

Experiment analysis

In this regard, Hefei City, the first high school physics teacher Wang Shiquan said that the water in the syringes is equivalent to a blunt convex lens, and the laser pen is relatively concentrated beam, "a parallel light projection on the convex lens, the light will diverge, Will be convex lens material amplification. "This way, with a ordinary laser pen to see the water microbial is not surprising. However, this method to see the microbes is only a rough, and can not see as meticulous as the microscope.