The refractive index is an important optical parameter of the medium，and the

measurement of the refractive index is an important part of the optical experiment. In

this experiment，a biprism and a flat glass are used as a container for liquid，a lateral

transmission device is added to the Michelson interferometer to control the movement of the

double air wedge，so an experimental device for measuring liquid refractive index has

been de- signed. This experimental method avoids complicated component processing. It is easy to

operate and has more ac-curate measurement results.