A rhombus is a parallelogram. It has four equal sides that are parallel to each other and diagonals that bisect each other at right angles. [1] X Research source You are going to make a template to form the side of this 2-D shape, which will be the projector screen for your hologram. The final shape of the projector will resemble a pyramid with a short flat top.
The finished shape should look similar to an isosceles trapezoid. [2] X Research source In other words, the template will show resemblance to a flat-topped pyramid. [3] X Research source If you want to make your template bigger you can double or triple each of the sides. For instance, the dimensions should be 2 cm by 7 cm by 12 cm if you want to double it. If you’re wondering why it matters, it’s because increasing the size of the template increases the size of your hologram. You might get a better quality hologram with a smaller template, but how big you choose to make your hologram is ultimately your choice. Just use the same proportions of the provided dimensions when you’re increasing the size.
Don’t worry if the plastic has some scratches on it. That doesn’t matter as much, but if you have a CD case with fewer scratches or none at all, it would be a better option.
If you have increased the size of your template, you may not be able to cut out four templates from a single plastic CD case. If not, salvage a few more plastic CD cases to cut out your templates.
If you have removed the sides of the plastic from the CD case, then cutting out the templates will be much easier because you’ll be able to press down.
You can glue the pieces together instead of taping them. However, this will likely take longer because you have to hold the pieces together until they dry.
