B, c, it can be seen from the figure that the refraction angle of A is large and the incident angle is equal. According to the refraction law n=sinisinr, the refractive index of glass to light A is small. According to the analysis of v=cn, it can be seen that the propagation speed of light A in glass is high, so BC is correct.
When D and A light hits the lower surface, the incident angle is equal to the refraction angle of the upper surface. According to the principle of reversible optical path, light must be emitted from the lower surface, so total reflection is impossible. So, d is wrong.
E and A light have low refractive index, low frequency and long wavelength. According to the formula △x=Ld, the spacing of interference fringes is proportional to the wavelength, so the interference fringes of A light are wider than those of B light. Therefore, e is correct.
So choose: BCE.