Rainbow Disappear .....

Newton Disc - Reverse Rainbow

Scientific Concepts :-

"Newton's disc" also known as Disappearing Colour Disc is a disc with segments painted in rainbow colours, i.e. violet, indigo, blue, green, yellow, orange and red, in that order. When the disc is rotated, the colors fade to white; Isaac Newton used this disc to demonstrate that white light is a combination of the seven different colours found in a rainbow.

When the disc is rotated, the color segments on the disc or colored wheel are dispensed such that when the colored wheel is rotated, a near white shaded color appears by the mixing of different primary colors.

Due to impurities of different colors used on the colored wheel disc, the complete white color is not realized but the effect is muddy white. The idea of performing this simple experiment is to show the persistent effect of the different colors on the retina of the eye is the mixture of all the colors, namely – white.

Colors and Light

Sun light is the primary source of colors! It is difficult for us to know what exactly is a color and light but we can understand about these significant science concepts by performing a simple science experiment.

Color basically depends on light and any object appears colored because of the way a color interacts with the light.

A thin line of light is called a ray made up of many rays of light beam.

When we talk about light, we generally mean about white light. The colors that make up white light disperse into seven bands of color. These bands of color are called a spectrum.

Through this amazing experiment, we are going to learn about white light is composed of the colors of the spectrum. Let us begin our easy, fun, and spectacular experiment!

Lets Make a Newton’s Disc

Material Required

Piece of cardboard and paper
Any Circular object to trace a circle such as cup / glass / cd/ dvd/ cap of big bottle etc.
Scissors
Glue
Pencil
Ruler
Crayons Colours / Sketch Color / Pencil Color
Cotton Thread or Wool ( Aprox :- 36 inch long)
Tooth pick

Step 1 - Cut the piece of cardboard and paper into equal size Circles

To do this you could trace something round with a pencil, use a drawing compass/ CD / DVD , or print a circle off of the computer. Though it does not matter what size circle you use, it is best to use a circle that would comfortably fit on a standard sheet of notebook paper. The larger your circle is the harder it will be to create the effects of the disc.

Step 2 - Glue the circled paper to the Card board

If you printed a color wheel from the internet, be sure to glue the color side up. Let the glue dry completely before moving on to the next step.

Step 3 - Divide the circle into seven equal Triangles

Use the ruler and pencil to make the lines on the circle. Think about this step as though you are “cutting into a pie.” You are creating a color wheel.

Step 4 - Color each of the seven sections a different color

Start at the top of the circle and work clockwise. Color the sections in with the following colors in this order: red, orange, yellow, green, blue, indigo, and violet.