Which plant cell structures could not be seen when using 10x objective of a compound microscpe

Structures such as the ribosome, endoplasmic reticulum, and mitochondria cannot be viewed by the 10x objective lens. These organelles are too small to be viewed with low magnification and require over 2000x magnification. At low magnification structures such as the cell wall, vacuoles, and cytoplasm can be viewed.

the link still does not work even when adding it to the url bar

explanation:

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.