What optical properties do holograms depend on? give explanations for answers and/or sources ! i need this for my science project!

A hologram is a physical structure that diffracts light into an image. The term ‘hologram’ can refer to both the encoded material and the resulting image.  A holographic image can be seen by looking into an illuminated holographic print or by shining a laser through a hologram and projecting the image onto a screen. Hope this helps! Oh and here's a good source to use just don't forget to credit the sources you use.

http://file.scirp.org/Html/70316_70316.htm

mass and volume are the answers you are looking for

if the person is shown to have +90n, then ans is -10n.

if the person is shown to have -90n, then ans is +10n.