Humpty Dumpty took the book, and looked at it carefully. ‘That seems to be done right’ – he began.
‘You’re holding it upside down!’ Alice interrupted. ‘To be sure I was!’ Humpty Dumpty said gaily, as she turned it round for him. ‘I thought it looked a little queer.’
Through the Looking-Glass
If you are going to make successful multicolor holograms, you need to know how to obtain correct color registration. All diffraction systems are sensitive to wavelength. The angle of diffraction of a beam is approximately proportional to its wavelength. This means that if you want to have red, green, and blue images (or red and cyan in an achromatic hologram) that coincide in both position and ...