Jojective
18. How will you be able to know that the revolving nosepiece of the HPO is properly aligned with the
eyepiece?
(A) The eyepiece fits perfectly with the objective.
(B) The eyepiece detaches from the revolving nosepiece.
(C) The revolving nosepiece of the objective turns easily.
(D) The objective produces a "click" sound when the revolving nosepiece is turned.
19 Which of the following shows the nmner
in bubb​