Midterm LOS .1

Question 1

Natural vs Man-made ?

Answer 1

Sun vs lightbulb

Question 2

Bioluminescent ?

Answer 2

Light from living organisms 
Bio means living 
Ex.Fireflies
Firefly shrimp
Glowing mushrooms 
Crystal jelly 
Glow worm 
Just as a joke thinkerbell

Question 3

Chemiluminescent?

Answer 3

Light from chemical reaction produces energetic particles that give off visible light energy

Ex.glow-sticks

Question 4

Fluorescent?

Answer 4

Full of mercury vapor
Absorbs
Particles release light immediately

Question 5

Incandescent?

Answer 5

Gets heated to super high temperatures emits visible light

Filament comes hot that it glows white

Question 6

Phosphorescent?

Answer 6

Phosphorescent particle take longer to emit light continue to glow for a while after the energy has been removed

Ex.Inner surface of a television and computer,possible phones

Question 7

Adv./disadvantage of incandescent/fluorescent

Answer 7

Incandescent cheap to buy but expensive to run,not toxic they can burn you not efficient 95% lost to heat have a mini heater in your room
Fluorescent there toxic hard to dispose of,cheap to run but expensive to buy very efficient

Question 8

How does light travel?

Answer 8

Straight lines, in ray’s straight lines radiating from the source in all directions,when light rays hit the surface they can be absorbed,reflected or transmitted or some combo of these

Question 9

Ray diagrams ?

Answer 9

Travels away from the light source

Fewer light rays reach your eyes the farther you are from a light source
Up close light is very bright
Far fewer light rays going into eyes

Question 10

What is light?

Answer 10

The form of energy you can see

It has the ability to do work(cause change)

Question 11

Pinhole/shadows?

Answer 11

Light travels straight lines

Light doesn’t bend

Question 12

Transparent/ translucent /opaque

Answer 12

Clear/frosty/can’t see through it
Allow light to pass through-some not all light to pass through is like it selectively permeable-prevent any light to pass through

Question 13

Shadow formed an object far and close from the light source?

Answer 13

Far=the hand is bigger kind of fuzzy
Close=crisp,small,black
Shadow is the lack of light

Question 14

Reflection?

Answer 14

The process in which light strikes a surface and bounces back off that surface
Change in direction
Law=the angle of reflection equals the angle of incidence
Out of the mirror

Question 15

Cost of light?

Answer 15

W divide 1000=kW

kW times hours =kWh*$/kWh

Question 16

Rough surfaces?

Answer 16

Was to be flat ,reflected in lots of direction no image

Question 17

Distance of object&virtual image ?

Answer 17

Same always
Behind reflected extended

Think focal point
Close=need facile
Far=upside down

Question 18

Refraction?

Answer 18

Bending of light as it changes media

Question 19

Speed of light?

Answer 19

300,000 km/s

Question 20

Change he medium?

Answer 20

Boundary between 2 substances
With different densities-think to particles
L M
A T Bend toward normal-less dense-more dense.Bend away from normal -more to les

Question 21

Concave & convex?

Answer 21

Concave -Virtual the image behind the mirror,caves in make real and virtual images
Convex-real light rays coverage at the image location and need to be continued produce a virtual image behind the mirror can collect light from a big place

Concave-close-need facile
Convex-far-upside down

Question 22

Luminous & non luminous?

Answer 22

Radiating or reflecting light shinning bright emitting light
Non-not capable of producing light but can be capable of reflecting light from another source