What can i say about the magnetic field? (in image)

Achlorine atom has 17 protons and 18 neutrons. what is its mass number? what is its atomic number?

What is the role of lenses in microscopy?

Which of the following is a characteristic shared by both electron and light microscopes? a. they both employ the use of objective lenses. b. both microscopes require an internal camera to visualize the specimen. c. both microscopes have a resolving power of 0.01 nm. d. they both utilize white light to magnify the specimen.