Common split ratios include 50/50, 70/30, and 80/20, though a beamsplitter can be designed to transmit or reflect as little as 5-10% of the light for monitoring purposes. It is a crucial part of many optical experimental and measurement systems, such as interferometers, also finding widespread application in fibre optic telecommunications. The 2 forms of beamsplitters are cube and plate type. Advantages are: minimal. The beamsplitter acts to divide the light's intensity in a given ratio over a range of wavelengths, generating two beams with the same spectral composition, if not the same intensity.