What is the difference between a hologram and a photograph?

 A photograph is a two-dimensional image of an object created by projecting light onto a photosensitive surface. It records only the intensity of the light 1.

On the other hand, a hologram is a three-dimensional image of an object created by holography. It records both the intensity and the phase of the light wave 1. A hologram uses a monochromatic and coherent source of light, while a photograph can use any source of light 1.

In summary, while photographs are two-dimensional images that record only the intensity of light, holograms are three-dimensional images that record both the intensity and phase of light waves 1.

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