Other contributors have said "In biology experiment why cannot use the same lancet twice?" is the same question as "What did Redi's experiment show in biology?" If you believe that these are not asking the same thing and should be answered differently, click here
Redi's experiment showed that the idea of organisms originating from non-living matter (as shown by the presence of meat), was incorrect. He believed in the concept of abiogenesis (a-not-bio-life genesis-origin)
Simply looking at a mirror requires reflection and refraction. By looking at a mirror, light reflects off of you and on to the mirror and back at you, and the light will refract throught the convex...