Light+energy

=**Reflection of light**=

UV: example of suncream IR: through the wall

Properties of reflect of light energy.


 * The speed of light = 299 792 458 m / s**

=**Refraction of light**=

The index of refraction is defined as the speed of light in vacuum divided by the speed of light in the medium. The indices of refraction of some common substances are given below with a more complete description of the indices for optical glasses given elsewhere. The values given are approximate and do not account for the small variation of index with light wavelength which is called dispersion.