1.Difference between absorption & action spectrum.

The absorption spectrum describes the range of a pigment's ability to absorb various wavelengths of light.

 

The action spectrum shows what wavelengths of light can actually be used to make photosynthesis work.

The electromagnetic spectrum, broken by a specific pattern of dark lines or bands, observed when radiation traverses a particular absorbing medium. The absorption pattern is unique and can be used to identify the material.

It shows which wavelength of light is most effectively used in a specific chemical reaction.