Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
24 Cards in this Set
- Front
- Back
|
What is electromagnetic radiation |
Light, form of energy |
|
|
What is an Electromagnetic wave |
What light travels in blue: magnetic field Red: Electric field Black:direction |
|
|
Light travels at |
300,000 km per second |
|
|
Surface of light |
Light when it hits the surface can be: -Transmitted through it -Reflected off it -Absorbed into it |
|
|
What is Transparent: & include an example |
Light hits the surface almost all light is transmitted through as substance a clear image can be seen through it. eg. clear glass shallow water |
|
|
What is Translucent: & include an example |
Some light may be reflected and light that passes though is scattered.An image through it is fuzzy eg. Tissue paper, finger rolls & frosted glass |
|
|
What is Opaque: & include an example |
Light is either reflected or absorbed by a substance and no light is transmitted. No image can be seen through eg. A brick, wood, desk & football |
|
|
What is Luminous |
An object that releases or emits its own light. |
|
|
What is reflection |
When light reflects off a very smooth surface such a mirror or window eg. See image when the light is reflected from a very smooth surface |
|
|
When does a Regular reflection occur |
From a very smooth surface and forms clear, sharp images. |
|
|
What is a diffuse reflection |
Surfaces reflect light in many directions and do not form an image |
|
|
Law of reflection |
The law of reflection states that the incident ray, the reflected ray, and the normal to the surface of the mirror all lie in the same plane. Furthermore, the angle of reflection equals to the angle of incidence . Angle of incidence=Angle of reflection I=R |
|
|
What is the image of law of reflection |
|
|
|
What is a plane mirror |
A flat mirror |
|
|
what is the lateral inversion |
means the apparent reversal of the mirror image's left and right when compared with the object |
|
|
What is a Virtual image |
When a plane mirror produces an image of an object, as a candle. It looks like its inside and behind the mirror |
|
|
An image is seen in a plane image |
-Upright -Same size as the object -Literally inverted -Is virtual -Appears as far inside the mirror as the candle |
|
|
What is refraction |
When light has been bent as it traveled at out the water, into the glass, to the air |
|
|
What is a refractive index |
As a measure of how easily light travels, through a substance |
|
|
What is there speed & refraction index Air Ice Water Perspex Glass Dimond |
Speed Refraction Index 300,000 1.00 231,000 1.31 226,000 1.33 200,000 1.49 197,000 1.52 124,000 2.42 |
|
|
What is the angle of refraction |
The angle made by a refracted ray with a perpendicular to the refracting surface. (Bends away from the norm) |
|
|
What are depth illusions |
Is when light from an object underwater is bent away from the normal when it leaves the water surface into the air. |
|
|
What is a critical angle |
The angle of incidence beyond which rays of light passing through a denser medium to the surface of a less dense medium are no longer refracted but totally reflected. |
|
|
what is a total internal reflection |
the complete reflection of a light ray reaching an interface with a less dense medium when the angle of incidence exceeds the critical angle. |
