Periscope vs. Telescope

Periscopenoun

A form of viewing device that allows the viewer to see things at a different height level and usually with minimal visibility.

Periscopenoun

(obsolete): A general or comprehensive view.

Periscopeverb

(intransitive) To rise and peer around, in the manner of a periscope.

Periscopeverb

To broadcast live video stream using Periscope app via phone or tablet.

Periscopenoun

A general or comprehensive view.

Periscopenoun

an optical instrument of tubular shape containing an arrangement of lenses and mirrors (or prisms), allowing a person to observe a field of view otherwise obstructed, as beyond an obstructing object or (as in submarines) above the surface of the water.

Periscopenoun

an optical instrument that provides a view of an otherwise obstructed field

Periscopenoun

an apparatus consisting of a tube attached to a set of mirrors or prisms, by which an observer (typically in a submerged submarine or behind a high obstacle) can see things that are otherwise out of sight.

Periscope

A periscope is an instrument for observation over, around or through an object, obstacle or condition that prevents direct line-of-sight observation from an observer's current position.In its simplest form, it consists of an outer case with mirrors at each end set parallel to each other at a 45° angle. This form of periscope, with the addition of two simple lenses, served for observation purposes in the trenches during World War I. Military personnel also use periscopes in some gun turrets and in armoured vehicles.More complex periscopes using prisms or advanced fiber optics instead of mirrors and providing magnification operate on submarines and in various fields of science.

Telescopenoun

A monocular optical instrument that magnifies distant objects, especially in astronomy.

Telescopenoun

Any instrument used in astronomy for observing distant objects (such as a radio telescope).

Telescopeverb

(ambitransitive) To extend or contract in the manner of a telescope.

Telescopeverb

(ambitransitive) To slide or pass one within another, after the manner of the sections of a small telescope or spyglass.

Telescopeverb

(intransitive) To come into collision, as railway cars, in such a manner that one runs into another.

Telescopenoun

An optical instrument used in viewing distant objects, as the heavenly bodies.

Telescopeverb

To slide or pass one within another, after the manner of the sections of a small telescope or spyglass; to come into collision, as railway cars, in such a manner that one runs into another; to become compressed in the manner of a telescope, due to a collision or other force.

Telescopeverb

To cause to come into collision, so as to telescope.

Telescopeverb

to shorten or abridge significantly; as, to telescope a whole semester's lectures into one week.

Telescopeadjective

Capable of being extended or compacted, like a telescope, by the sliding of joints or parts one within the other; telescopic; as, a telescope bag; telescope table, etc.; - now more commonly replaced by the term telescoping.

Telescopenoun

a magnifier of images of distant objects

Telescopeverb

crush together or collapse;

Telescopeverb

make smaller or shorter;

Telescope

A telescope is an optical instrument using lenses, curved mirrors, or a combination of both to observe distant objects, or various devices used to observe distant objects by their emission, absorption, or reflection of electromagnetic radiation. The first known practical telescopes were refracting telescopes invented in the Netherlands at the beginning of the 17th century, by using glass lenses.