Answer :
The answer is b. microscope.
A microscope is an optical instrument used to see objects invisible to the human eye. There are different types of microscopes - optical microscope, transmission electron microscope, scanning electron microscope, scanning probe microscope, ultramicroscope.
A microscope is an optical instrument used to see objects invisible to the human eye. There are different types of microscopes - optical microscope, transmission electron microscope, scanning electron microscope, scanning probe microscope, ultramicroscope.