| As to double refraction, fresnel made it depend on the unequal elasticity of the aether in different directions. |
| Also, bear in mind that the fresnel lens both flips the image upside down and has a mirror effect on the text. |
| I checked all around, studied up on the differences in fresnel lenses and finally decided on the F550 lens from 3Dlens.com. |
| From that time the undulatory theory lost ground, until it was revived by Young and fresnel. |
| But for lenses the burner has seventeen films of flame, and is said to possess six times the power of the fresnel lamp. |
| The light-house has since been rebuilt, and shows a fresnel light. |
