From the study's science project artifacts, two simple direct camera artifacts that use pvc pipes is the best material from the survey questionnaire because pvc pipes is a waterproof material and its weight and strength are heavier and better than aluminum because the strength equivalent, and the price is very different materials make the pvc pipe to make the most of the camera and binoculars that have simple equivalent of the telescope, and the price is cheaper. From the trial. Summary of the invention, the telescope mirror is a simple performance equal to the binoculars to see stars, but with material that is simple and cheaper, thus making the simple binoculars is ideal somma rather than make a simple telescope is better performance.
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