Fizeau interferometer
![Figure 1. Fizeau interferometer](/Images/godic/202501/13/Fizeau_interferometer_testing_optical_flat.svg5023.png")
![Figure 2. Optical testing with a Fizeau interferometer and a computer generated hologram](/Images/godic/202501/13/Fizeau_optical_testing_with_computer_generated_hologram5023.png")
![Figure 3. Fizeau interferometer for measuring the effect of water movement upon the speed of light.](/Images/godic/202501/13/Fizeau_interferometer5023.JPG")
A Fizeau interferometer is an interferometric arrangement whereby two reflecting surfaces are placed facing each other. As seen in Fig 1, the rear-surface reflected light from the transparent first reflector is combined with front-surface reflected light from the second reflector to form interference fringes.