| parallax |
|
noun
- The change of angular position of two stationary points relative to each other as seen by an observer, due to the motion of an observer
- The apparent shift of an object against a background due to a change in observer position
|
|
| periscope |
|
noun
- (obsolete): A general or comprehensive view.
- A form of viewing device that allows the viewer to see things at a different height level and usually with minimal visibility.
|
| PH |
|
abbreviation - Philippines
- public house
- Penthouse
- Preliminary Hearing
|
| photic |
|
adjective
- of, related to, or irradiated by light; especially describing that part of the near-surface ocean is which photosynthesis is possible
|
| photoinduced |
|
adjective
- induced as a result of interaction with electromagnetic radiation
|
| photometer |
|
noun - (physics) Any of several instruments used to measure various aspects of the intensity of light
|
| photometry |
|
noun - (physics) The measurement of various aspects of light, especially its intensity
- (astronomy) The measurement of the intensity and spectrum of light from stars
|
| photomicroscope |
|
noun
- an instrument (microscope plus camera) that is used for making photomicrographs
|
| photomultiplier |
|
noun - (physics) A device, normally in the form of a tube, that uses a photocathode to convert photons into photoelectrons which are then amplified
|
| plano-convex |
|
adjective
- Flat or plane on one side and rounded on the other, such that the center is thicker than the edges.
|
| polarimeter |
|
noun
- an instrument used to measure the rotation of the plane of polarized light as it passes through a sample of an optically active compound
|
| polariscope |
|
noun
- a polarimeter
|
| polarization |
|
noun
- the production, or the condition of polarity
- (physics) the production of polarized light; the direction in which the electric field of an electromagnetic wave points
- (context, chemistry, physics) the separation of positive and negative charges in a nucleus, atom, molecule or system
- the grouping of opinions into two extremes
|
| primary |
|
noun (primar, ies)
- A preliminary election to select a political candidate.
- The first year of grade school.
- A base or fundamental component; something that is irreducible.
- The most massive component of a gravitationally bound system.
verb (primaries, primarying, primaried)
- To take part in a primary election
adjective
- The first in a group or series.
- Children attend school, teenagers attend secondary school.
- That which is placed ahead of others.
- Preferred stock has claim on dividends, ahead of common stock.
|
| prism |
|
noun
- (mathematics) A polyhedron with parallel ends of the same size and shape, the other faces being parallelogram-shaped sides.
- A transparent block in the shape of a prism (typically with triangular ends), used to split or reflect light.
- A crystal in which the faces are parallel to the vertical axis.
|
| prismatic |
|
adjective
- Of or pertaining to a prism; having the form of a prism.
- Separated or distributed by, or as if by, a transparent prism; formed by a prism; varied or brilliant in color.
|
| projector |
|
noun
- an optical device that projects a beam of light, especially one used to project an image (or moving images) onto a screen
|
| pseudoscope |
|
noun
- (optics) An optical instrument that reverses perception of depth.
|
| purity |
|
noun (purities)
- The state of being pure.
|
