This article reviews the same-frequency mutual interference explanation of gravitational bending light, gravitational lensing and light bending, analyzes the observation data of HerS-3 Einstein Cross, and uses the same-frequency mutual interference explanation of light bending to deduce the rationality of the formation of the HerS-3 Einstein Cross. This article believes that the light starts from the large When passing by a massive luminous planet (galaxy), the light bends due to the influence of electromagnetic waves continuously emitted by the massive luminous planet (galaxy). The degree of bending of the light is directly proportional to the brightness of the massive luminous planet and inversely proportional to the shortest distance between the light and the planet, regardless of the mass of the planet. Generally, the mass-to-light ratio (excluding dark matter) of planets (galaxies) in the universe is much smaller than the mass-to-light ratio of the sun. Therefore, the degree of light bending calculated using the gravitational lens principle is much smaller than the actual value. At this time, we have to use non-existent dark matter to supplement it. The HerS-3 Einstein cross derivation of dark matter is another example. However, using the same-frequency mutual interference explanation of light bending will not deduce dark matter, which is consistent with observational reality.