| Answer | Crossword Clue |
|---|---|
| periscopic | (of a lens or an optical instrument) Giving a wide field of view |
| crosshair | a fine wire at the focus of an optical instrument, crossing the field of view, to aid in positioning or measuring also CROSSWIRE |
| crosshairs | CROSSHAIR, a fine wire at the focus of an optical instrument, crossing the field of view, to aid in positioning or measuring also CROSSWIRE |
| microscope | an optical instrument consisting of a lens or combination of lenses for making enlarged images of minute objects |
| microscopes | MICROSCOPE, an optical instrument consisting of a lens or combination of lenses for making enlarged images of minute objects |
