Special:Badtitle/NS90:User talk:Diogo Simões/Copyright violation/reply (2)

This part of the last paragraph: "Deviated light passes through the specimen and is retarded by a quarter of a wavelength. The beams are recombined further along the light path, the differences in the phase of the deviated and undeviated light beams become additive and subtractive. The resultant wave is the sum of the two waves which have their crests and troughs opposite each other and is four times darker than the background. Therefore, the specimen appears four times darker than the background. The net result is that features of the object are either lighter or darker than the surrounding field." is still too similar to the original text and should be changed a little bit more.