The angle of incidence you mentioned, 48 degrees, refers to the angle at which a narrow beam of light strikes one of the sides of an equilateral triangular prism. However, to fully understand and analyze the situation, we need additional information.
If you have a specific question or scenario related to the interaction of light with the prism, please provide more details, such as the properties of the prism (refractive index, dimensions), the angle of refraction or reflection, or any specific calculations or observations you would like to make. With more information, I’ll be able to provide a more tailored and comprehensive response.