optics Flashcards
Law of Reflection (convex)
convex mirrors cause reflected rays to diverge
Law of reflection (concave)
reflected rays converge to a central points
SALT
smaller
attitude
location
type
Sources of light, how they’re produced, examples
Incandescence – very high temperatures. ex. candle, lightbulb
Electrical discharge – an electric current is passed through a gas. ex. glass lights, lightning
Fluorescence – UV light is converted to visible light immediately. ex. fluorescent lightbulb
Phosphorescence – absorption of UV light followed by emission of visible light over a period of time. ex. glow in the dark
Chemiluminescence – chemical reaction. ex. glowing bracelets
Bioluminescence – chemical reaction in a living organism. ex. glow bugs
Triboluminescent – from the friction of scratching crystals. ex. life savers, crystals
Light emitting diodes – electric current passes through a semi conductor. ex. indicator light, christmas light.
Incandescence
very high temperatures. ex. candle, lightbulb
Electrical Discharge
an electric current is passed through a gas. ex. glass lights, lightning
Fluorescence
UV light is converted to visible light immediately. ex. fluorescence lightbulb
Phosphorescence
absorption of UV light followed by emission of visible light over a period of time. ex. glow in the dark
Chemiluminescence
chemical reaction. ex. glowing bracelets
Bioluminescence
chemical reaction in a living organism. ex. glow bugs
Triboluminescence
from the friction of scratching crystals. ex. life savers, crystals
Light emitting diodes
electric current passes through a semi conductor. ex. indicator light, christmas light.
Properties of light
light travels faster than any known entity
light travels in waves
light travels in straight lines
light energy is transferred through radiation
Speed of light
3X10^8
Types of electromagnetic radiation, from longer to shorter wavelength
radio microwave infrared ultraviolet xray gamma ray
Opaque, translucent and transparent examples
Opaque - human body, cardboard
Translucent - sunglasses, tinted windows
Transparent - air, pure water
Laser lights characteristics
Monochromaticity - laser light is only a single color, it splits when in a prism because wave lengths are slowed down
Divergence - Laser lights do not spread out or diverge
Coherence - Laser lights have coherent waves
Why does light refract
it refracts when it travels at an angle with a different refractive index. the change in direction is because of a change in speed.
What is a critical angle.
What is the point where it is reflected.
An angle of incidence is no longer refracted but reflected.
Greater than 90
