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B
Optical microscope
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C
Both optical and electron microscope
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D
Oil immersion lens
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Solution
The correct option is A Electron microscope
An optical microscope is also known as a light microscope that commonly uses visible light and a system of a lens to magnify images of small objects.
Most of the cell organelles (nucleus, cell membrane, mitochondria etc) are not clearly visible under an optical or light microscope because their size is close to the limit of resolution of these microscopes.
An electron microscope uses electrons to illuminate a specimen or objects to create an enlarged image.
These microscopes have much greater resolution than light microscopes and help to achieve much higher magnifications.
This microscope helps to observe different cell organelles.