limbiks_APZNZA~4.PDF Flashcards
What is refraction?
Bending of light
Why does light bend?
Changes speed
What causes changes in light speed?
Different densities
What is the angle of refraction?
Direction of light
Where do you measure the angle of refraction from?
Normal line
What happens to the angle of refraction when the angle of incidence changes?
It changes
How does light behave when moving into a denser medium?
Bends towards normal
How does light behave when moving into a less dense medium?
Bends away from normal
Diagram (a): air to glass
Angle of incidence: 25 degrees
Angle of refraction: 15 degrees
Light entering glass bends toward normal line
Diagram (b): water to air
Light entering water bends away from normal line
Diagram (c): transparent plastic to air
Angle of incidence: greater than angle of refraction
Light entering air bends away from normal line
What happens when you pour water, oil, and glycerine into a graduated cylinder?
Three distinct layers.
What is the new angle called when a pencil is placed in a cylinder of water?
Angle of refraction.
Why does the pencil appear at an angle in the cylinder?
Due to density differences.
What is the speed of light in air?
300 million m/s
