Explain periscope, photometer, and polygraph?
Answers
Periscope . . this used to view objects above sea level and it is used in submarines..
photometer. .. it is the instrument compares luminous intensity of the source of light.
and polygraph.. it is an instrument and that simultaneously records changes in physiological processes such as heartbeat , blood pressure and respiration and used as a lie detector..
hope it helps..
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1) 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 and/or advanced fiber optics instead of mirrors, and providing magnification, operate on submarines and in various fields of science.
2)A photometer, generally, is an instrument that measures light intensity or the optical properties of solutions or surfaces. Photometers measure:
Illuminance
Irradiance
Light absorption
Scattering of light
Reflection of light
Fluorescence
Phosphorescence
Luminescence
3)A polygraph, popularly referred to as a lie detector, measures and records several physiological indices such as blood pressure, pulse, respiration, and skin conductivity while the subject is asked and answers a series of questions. The belief underpinning the use of the polygraph is that deceptive answers will produce physiological responses that can be differentiated from those associated with non-deceptive anawers.