Remove the four slick pads on the bottom, to reveal screw holes (usually two, sometimes four) and clip holes (usually two, sometimes none). Undo the screws, unclip the clips, and the top will come off.
i think optical instrument is the instrument to study biologies that not even Using a electricity ..Like microscope and Non-optical instrument is which instrument is using a electricity like electron...
Optics is the branch of science that deals with the behaviour of light. Any thing which comes under the purview of this is termed optical. for eample optical lens, optical microscope .........etc