CHAPTER 2 Flashcards
Light moves at great speed (approximately _______________ through the vacuum of space.)
300,000 km or 186, 000 miles per second
Speed of Light energy travels through space at 186,000 miles per second or approximately ___________ around the earth in each second.
seven and halftimes
When traveling through water glass, the speed of light energy is ________ and the various wavelengths travel at slightly different speeds. This makes it possible to break up abeam of white light through a glass prism into the spectrum of colors.
reduced
Any phenomenon having a periodic disturbance of some sort and travels outward from a source.
WAVE
Light maybe visualized as such the high points are called __________.
crests
Light maybe visualized as such the low points are called __________.
troughs
The distance between two successive crests (or troughs) is called a __________.
wavelength
Different types of radiations.
- Gamma ray
- X-ray
- Ultraviolet
- Infrared
- Microwave
- Radio
The mentioned light colors and their combinations constitute the so-called ___________ as their presence could be detected by the human eye.
visible light
Radiations which cannot be detected by the eye as receptors.
invisible lights or invisible rays
The region on the left of the visible light. In wavelength it extends from 400 to 200 millimicrons.
Ultra-violet
The radiations to the right of the visible light. Which are too long in wavelength to excite the retina to an impression of light.
Infrared rays
The skin detects Infrared ray’s impact as __________.
heat
The usual units used to measure the wavelength of the different types of radiation which make up to the electromagnetic spectrum are the __________ and __________.
Millimicron and the Angstrom
It is the science concerned with the behavior of light.
Optics.
TWO MAIN SOURCES OF LIGHT
- Natural
- Artificial
Refers to the daylight coming from the sun, which is generally utilized for outdoor photography.
NATURAL LIGHT
Classification of Natural light according to its intensity.
A. Bright Light
B. Hazy Light
C. Dull Light
A lighting condition wherein objects in open space cast a deep on uniform shadow
Bright Light
A lighting condition wherein the objects in open space cast a transparent shadow
Hazy Light
In hazy light condition, the sun is covered by the clouds and shadow which appears ________ because of the decrease of the light falling on the subjects in open space.
bluish
A lighting condition wherein the objects in open space cast no shadow.
Dull Light
In dull light conditions, the sun is totally covered by thick clouds. _________ are formed due to the uniform illumination of light around the subjects in open space
No shadow
This refers to man-made sources of light used or utilized for indoor photography to align the adverse lightning conditions. It is also utilized to align the hazy or dull light in outdoor photography.
ARTIFICIAL LIGHT