If light is a form of energy, explain how light can be different colours. thx.

Light, more appropriately visible light, is just a small
portion of the energy spectrum, which ranges from radio waves with very long wavelengths
to x-rays to cosmic rays (very short). A wavelength is the distance between the two tops
(or bottoms) of a wave. The light we see has different wavelengths. Red is the longest,
with a wavelength of about 700 nanometers (nm); blue is the shortest, at about 400 nm.
Some include the regions just outside our vision as visible light; infrared and
ultraviolet.

Our eyes see all of the visible spectrum as
one color, white. A prism or other refracting body can separate colors since each color
will bend slightly differently. That is what a rainbow is; white light bouncing through
- and being separated by, water droplets.