Which cell type is not an example of eukaryotic cell

The nuclear material in the cell or the DNA is contained within a double membrane. Bacteria are the only type of cells that are not eukaryotic, they are prokaryotic so they do not have DNA encased within a membrane.

Explanation:

The speed of light is greater in air than water or glass. light travels faster in air than in water or in glass. this is the reason why light bends more when it enters glass or water. the is because refractive index of water or glass is more than the refractive index of air and hence the light bends.