The mitochondria and chloroplast. There is one more but I don't remember it!
Either a light microscope or an electron microscope can allow you to observe cell organelles.
The organelles in a cheek cell that are not visible under a light microscope are the ribosomes. These organelles are responsible for protein synthesis.
It is not possible to see organelles with a compound light microscope because some organelles are to small to be seen with the low magnification of the light microscope. If they can not be seen through the compound microscope they are normally looked at through the electron microscopes (transmission electron microscope {TEM} or scanning electron microscope {SEM}).
look at it in microscope
A light microscope is typically used to view lysosomes. Lysosomes are small organelles within cells and can be observed using a light microscope at high magnification.
Some organelles, like ribosomes, are too small to be resolved using a light microscope because their size is close to the limit of resolution of light. Additionally, some organelles may not have distinctive features or contrast with the surrounding cytoplasm, making it difficult to visualize them clearly under a light microscope.
scanning electron microscope
Under a compound light microscope, you would not be able to see specific organelles like the lysosomes, peroxisomes, endoplasmic reticulum, and Golgi apparatus in an onion cell stained with iodine. These organelles are typically smaller and/or transparent, making them difficult to visualize with this type of microscope.
Most organelles are very small and require a magnification greater than the x1500 available using a light microscope. An electron microscope is required for greater magnification and resolution. Therefore a small area of the slide is avalible.
An electron microscope is typically used to view organelles, as it provides a higher resolution and can visualize smaller structures compared to a light microscope. Transmission electron microscopes (TEM) are often used to view organelles at high magnifications.
glogi apperatus and vacuoles
The organelles that can absorb iodine stain and be seen with the low power of a compound light microscope are the nucleus and the starch granules (amyloplasts). Iodine stains the nucleic acids in the nucleus and the stored starch in the amyloplasts, making them visible under the microscope.