What is the difference between ocular and objective lenses?

An ocular lens is attached to a variety of optical devices such as telescopes and microscopes.

Objective lens is the nearest to the object being viewed

The proton has a positive charge while the neutron has no charge they both make up the nucleus of the atom while the elections have a negative charge and surround the nucleus of the atom. the protons and electrons are used to calculate the atom's mass whereas the neutrons don't affect the mass

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