Why are CDs shiny?
In fact, a CD is almost pure polycarbonate plastic. The surface of a CD is reflective because the disc is coated with a thin layer of aluminum or sometimes gold. The shiny metal layer reflects the laser that is used to read or write to the device. A layer of lacquer is spin-coated onto the CD to protect the metal.
What will happen if you shine a CD with a flashlight?
The colors you see reflecting from a CD are interference colors, like the shifting colors you see on a soap bubble or an oil slick. You can think of light as as being made up of waves-like the waves in the ocean. When light waves reflect off the ridges on your CD, they overlap and interfere with each other.
Can CDs go bad?
Well-cared-for CDs can last many decades — even centuries. But storing a disc in a hot car or playing it often can eventually lead to “CD rot.” “By increasing the relative humidity and temperature, you’re increasing the rate of chemical reaction occurring,” she says.
Can you fix scratched CDs?
Incredibly, scratches in the surface of a CD or DVD can be fixed with softened wax! As with the toothpaste fix, you can use shoe polish, lip balm, furniture wax, or even petroleum jelly. Again, rub it into the surface of the disc to fill the scratch. With a lint-free cloth, wipe of the excess wax, with a radial action.
Do scratched CDs still work?
Because standard CDs and DVDs have a protective layer, these discs can usually withstand several scratches with no issues. However, a deep scratch or a lot of scratches can cause the disc to not work correctly.
Can you make a rainbow with a LED flashlight?
You can make this really simple and just hold a CD up to some sunlight – or shine a flashlight on one in a darkened room – and you will see a rainbow on the CD.
How do you make a rainbow in your room?
Instructions
- Fill the glass with water.
- Put the mirror into the water inside the glass at an angle.
- Position the glass so that sunlight shines directly at the mirror.
- Look for a reflection on the wall.
- Adjust the angle of the mirror until you see a rainbow on the wall.
How many years do CDs last?
Among the manufacturers that have done testing, there is consensus that, under recommended storage conditions, CD-R, DVD-R, and DVD+R discs should have a life expectancy of 100 to 200 years or more; CD-RW, DVD-RW, DVD+RW, and DVD-RAM discs should have a life expectancy of 25 years or more.
Can we touch rainbow?
You can Not touch the rainbow… Because it is not a physical object. A rainbow is “a distorted image of the sun” whose light raindrops bend, reflect and scatter on its way to our eyes.
