When we place two prisms coaxially (meaning their axes are aligned) but not opposite to each other and then pass light through them,

the light will undergo multiple refractions and deviations from its original path.

Each prism will bend the light in a particular direction, based on the angle of incidence and the refractive index of the material the prism is made of.

If the prisms are not oriented opposite to each other, the deviations caused by each prism will add up or cancel out, depending on the direction and angle of the light passing through.

The exact outcome would depend on the specific angles of the prisms and the properties of the material the prisms are made from.

If the prisms are oriented in such a way that their deviations add up, the final deviation of the light will be more significant than that caused by a single prism.

If the deviations partially or completely cancel out, the light might emerge with little or no deviation.

In general, if we pass light through a system of multiple prisms that are not arranged opposite to each other, we will get a complex pattern of deviation and dispersion,

and predicting the exact outcome would require knowing the angles and refractive indices of the prisms involved.

This setup could be used for various optical experiments and applications, such as spectral analysis and dispersion of light into its component colors.