Optics

[tangur]

If a solid cyclinder of glass or clear plastic is placed above the words LEAD OXIDE and view from above, the LEAD appears inverted but the OXIDE does not.

The word lead is in red and the oxide is in blue. I'm thinking that since the wavelength of red light is longer, you have a left-right inversion , and since the blue light has a shorter wavelength, no inversion occurs.

Any help is appreciated

[Claude Bile]

The wavelength should not effect whether the image is inverted or not. My guess is that the word OXIDE has a horizontal axis of symmetry thus its inverse is identical to the original image and thus does not appear inverted.

Claude.