Sunlight is polychromatic light with different frequencies of red, orange, yellow, green, indigo and purple. These have different refractive indexes for the same medium, so a beam of light will be refracted at different deflection angles after entering the prism (the law of refraction of light.

The sine of the incident angle is proportional to the sine of the refraction angle, and the proportional coefficient is the refractive index), so the light beam propagating in one direction will be decomposed into light bands arranged in the order of deflection angle. (Deflection angle = refraction angle-incident angle. In the above case, the incident angles of light with different frequencies are the same. )

Manufacturing steps of prism

Materials required: three pieces of glass and black electrical tape with the same area.

1. Stick the glass slides together with electrical tape, and the distance between the glass slides is 0.2 cm.

2. Assemble three slide rails into a regular triangle, and fix the top angle with electrical tape.

3. Completely cover the surface of the trihedron composed of glass slides with black electrical tape.

4, do a good job of prism viewing effect, remember that the electrical tape must be black, but if you use other colors of tape, it is easy to transmit light, but it will interfere with imaging.