Are angles of incidence and emergence equal in prism?

Yes, in a prism, the angle of incidence is equal to the angle of emergence when light passes through it, assuming the prism is made of a uniform material and there is no absorption or scattering. This occurs because the light entering and exiting the prism does so at the same angle relative to the normal at the respective surfaces. However, the angle of refraction inside the prism can differ depending on the prism's material and the wavelength of light.