Fig. 3 is a stroboscopic photograph of an athlete hitting a ball taken by a high-speed camera.

Fig. 3 is a stroboscopic photograph of an athlete hitting a ball taken by a high-speed camera. Do a good job of debugging every shot. The light emitted by the light source diffuses when it hits the athlete, and the athlete forms an inverted and reduced real image through the convex lens in front of the camera. According to the characteristics of stroboscopic photography, observe the photos and compare the racket technology.