Chapter 1 Flashcards
(32 cards)
1
Q
Incandescence
A
- Light that is emitted by a very hot object because of high temperature of the material
2
Q
Fluorescence
A
- Energy of the UV light that is absorbed by the phosphor, which emits visible light.
- This visible light that is emitted is called fluorescence.
3
Q
Bioluminescence
A
- Light that is produced by living organisms.
4
Q
Phosphorensce
A
- when something glows with light without becoming hot to the touch, like the glow-in-the-dark stars on your bedroom ceiling.
5
Q
Luminous
A
- Objects that emit light rays produced from other energy sources
6
Q
Non- Luminous
A
- Objects that scatter the light rays from luminous objects
7
Q
Wave length
A
- The distance from one crest of a wave to the next crest
8
Q
Reflection
A
- Change in direction of a light ray when it bounces off a surface
9
Q
Medium
A
- Substance through which light travels
10
Q
Incident ray
A
- Ray of light coming toward a surface
11
Q
Angel of incidence
A
- Angle between the incident ray and the normal in a ray diagram
12
Q
Reflected ray
A
- ray that begins at the point where the incident ray and the normal meet
13
Q
Normal
A
- line that is perpendicular to a surface where a ray of light meets the surface
14
Q
Electromagnetic Spectrum
A
- The entire range of electromagnetic waves from low to high frequency.
- Made up of RADRO, MICROWAVE, INFRARED, VISIBLE SPECTRUM, ULTRAVIOLET, X-RAYS, GAMMA RAYS.
15
Q
virtual Image
A
- No light rays actually going to or coming from the image behind the mirror
- Light rays only appear to be coming from the Image
16
Q
Concave Mirror
A
- Mirror whose reflecting surface curves inward
17
Q
Principal axis
A
- The thick, horizontal normal that touches the center of the mirror
- Helps locate the positions of objects that are placed in front of the mirror
18
Q
Focal Point
A
- The focal point of a lens is generally noted by the capital letter “F.” This is the point in space where the light rays will converge to after passing through a converging lens.
19
Q
Focal Length
A
- The distance from the center of the lens to the focal point.
20
Q
Principal Axis
A
- The principal axis is a horizontal imaginary line drawn through the center of the lens.
21
Q
Real Image
A
- Image that is formed when reflected rays meet
22
Q
Convex Mirror
A
- Mirror whose reflecting surface curves outward
23
Q
Refracted ray
A
- Ray that is bent upon entering a second medium
24
Q
Angle of refractuib
A
- The angle between the normal and a refracted ray
25
Index of refraction
The ratio of the speed of light in a vacuum to the speed of light in a given medium
26
Critical angle
angle of incidence that produces and angel of refraction of 90 degrees.
27
Frequency
The number of crests of a wave that move past a given point in a given unit of time.
Most common unit of frequency is the hertz (Hz), corresponding to one crest per second.
Frequency of a wave can be calculated by dividing the speed of the wave by the wavelength.
28
Speed of light
???
29
Lens
A clear curved piece of glass or plastic that is used in eyeglasses, cameras, telescopes, etc., to make things look clearer, smaller, or bigger
30
Laser
A laser is a special source of light of only one pure color (or WAVELENGTH). You can't break up laser light into other colors.
31
Magnification
?
32
4 characteristics of an image in a plane mirror
- Image is the same size as the object
- The same distance from the mirror as the object
- The same orientation as the object
- The image is a virtual Image
