An analysis of a magical bright stripe which never disappears in double slit interference

The bright dark stripe image of double slit interference is significantly different from the bright dark stripe image of single slit diffraction. At present, there is no research on how to transition from double slit interference to single slit diffraction for bright and dark stripe images. An experiment was proposed to observe the changes in bright and dark stripe images by gradually blocking the right slit of the double slit, transforming the double slit interference into single slit diffraction. A new discovery has been made, which cannot be explained by the wave theory of light, a bright stripe that cannot disappears. A new theory was proposed that after passing through the double slit mask, light move in a spiral elliptical shape, and photons are thrown out at the edge of the ellipse, which is also the center of the double slit mask, forming a bright stripe forward. And the residual light from the left slit creates a bright stripe that cannot disappears. Finally, software simulations using Python Turtle demonstrate that the new theory is correct.