Assertion: simple periscope | /r/RelatedTo | periscope
Facets:
Source sentences:
text: This simple periscope uses only flat mirrors as compared to the periscopes used on submarines, which are usually a complex optical system using both lenses and mirrors.
text: The simple periscope in Figure 1 uses only flat mirrors as compared to the periscopes used on submarines, which are usually a complex optical system using both lenses and mirrors.