Physics #2 quiz

Question 1

light travels in …

Answer 1

-straight line
-wave

Question 2

what travels at a constant speed (as long as the medium stays the same)

Answer 2

visible light

Question 3

refraction

Answer 3

Is a property of light in which the speed of light and its direction of travel change.

Question 4

light can pass through a medium or substance it is incident on. such as pencil in glass full of water. how?

Answer 4

The ray of light that travels through the glass (and then through the water) is called the refraction ray.

Question 5

light can not travel faster than?

Answer 5

3.0 × 108 m/s, which is the speed of light in a vacuum.

Question 6

3 rules for refraction

Answer 6

-incident ray, refracted ray, and normal all lie on same plane
-light bends toward the normal it travels more slowly in the second medium then the first
-light bends away from the normal if it travels faster in the second medium than in the first

Question 7

At what angle do you think the angle of incidence must be in order for the light NOT to refract? (i.e. refraction of 0)

Answer 7

occurs when light travels from one medium to another with the same index of refraction. This phenomenon happens when light enters a medium perpendicularly to the surface interface between the two mediums. In other words, the angle of incidence is 0 degrees.

Question 8

When you change the angle of incidence, what happens to the angle of refraction?

Answer 8

angle of refraction will increase or decrease accordingly

Question 9

optical density or index of refraction

Answer 9

Optical Density:
-measure of how much the speed of light is reduced inside the medium
Eg. Water vs. glass
Glass is more optically dense than water, therefore causes light to bend more.

Question 10

how to calculate index of refraction/ optical density

Answer 10

n= c/v
c= speed of light
v=speed of light in a given medium

n- speed of light in a vacuum/ speed of light in a medium

Question 11

THE SLOWER LIGHT MOVES IN A MEDIUM (I.E. “V” DECREASES) THE GREATER THE INDEX OF REFRACTION WILL BE

Answer 11

The greater the index of refraction,
the more the speed of light will slow
down in that material.

Question 12

another way of finding index of refraction

Answer 12

n = sin<i / sin<R

snells law
ni0i=nR0R

Question 13

light bends where from a fast to a slow medium

Answer 13

towards normal

Question 14

light bends from slow to fast medium

Answer 14

away from normal

Question 15

apparent depth

Answer 15

depth of object due to refraction of light in transparent medium because eyes only see in straight lines

Question 16

flattened sun

Answer 16

near horizon appears to flat because air is more dense near the surface than higher in the atmosphere

Question 17

apparent sunsets

Answer 17

sun rays bend because of temperature differences so it looks like the sun is above even though its already set

Question 18

water on pavement

Answer 18

mirage occurs when light travels from cooler to warmer air, causing light to bend

Question 19

shimmering heat waves

Answer 19

convection of air creates different layers with different densities, constant shifting and bending of light

Question 20

dispersion

Answer 20

seperation of whitelight into respective waves lengths and its IRS because each color of light travels at different speeds

ex. rainbow: when light travels through water droplets they refract and disperse into white light.