Objects less than $0.2\, �m$ in size cannot be seen under light microscope because

Because at the wavelength of visible light $(3900\, � \,to\, 7800 \,�)$ objects cannot be resolved that are less than $0.2\,�m.$

The wave length of visible light is $3900 \,�$ to $7800\, �$

Only two types of lenses are used

Maximum magnifying power of ocular lens is $20\, X$

Maximum magnifying power of objective lens is $100\, X$

The wave length of visible light is $3900 \,�$ to $7800\, �$

Only two types of lenses are used

Maximum magnifying power of ocular lens is $20\, X$

Maximum magnifying power of objective lens is $100\, X$

Objects less than $0.2\, �m$ in size cannot be see

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A cell is derived as the functional and structural unit of life. Every cell is surrounded by a cell membrane that dissects the external and internal environments of the cell. The interior environment of a cell is called the cytoplasm.
It carries cellular machinery and structural elements. The nucleus is present in the center of the cell, which includes all the hereditary information of an organism. Some of the molecules present in the cell are protein, carbohydrates, starch, and sugar.

Read More: Fundamental Unit of Life: Cell

The different parts of a cell and their functions are as follows: