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AP Physics 2 Videos 59 videos

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AP Physics 2: 2.2 Waves 166 Views


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Description:

AP Physics 2: 2.2 Waves. Which of the following scenarios is the least dispersive of light?

Language:
English Language

Transcript

00:00

Thank you three weeks and here's your shmoop do you

00:05

sure brought to you by light waves Because without him

00:08

the world would be a much darker place on this

00:11

whole video thing Well it really wouldn't work very well

00:13

with it All right which of the following scenarios is

00:16

the least Disperse ihe ve of light All objects have

00:20

the same refractive index and hear The potential answers are

00:25

Art least disperse It means light's going to go through

00:28

and basically stay on the same path All right Well

00:31

let's go get a drink of water These physics things

00:33

or making us thirsty Important clear glass and drink through

00:36

a straw before we take a drink Though let's look

00:39

at the straw The portion of the straw that's under

00:42

water looks like it's in a different position in the

00:44

portion that's above water magic Well that's because the light

00:48

reflecting back to us from the straw under the water

00:50

is going through glass and water before hitting our eyes

00:53

Those materials bend the light so it hits our eye

00:57

at a different angle than the light from the upper

00:59

portion of the straw So it looks like the straws

01:01

bent or broken But when we take a sip of

01:04

that straw works just fine So refreshing All right When

01:08

light goes through a medium with a higher refractive index

01:10

and air which is pretty much everything the lightwaves bend

01:14

because the material they travel through slows them down The

01:18

angle of the bend depends on the type of material

01:21

But if the light hits the surface of something that's

01:23

already at an angle like a triangular prism resulting bend

01:28

will be larger than if it hit the surface head

01:30

on And the same thing happens when light exits something

01:34

like glass it ben's as it moves from one material

01:37

to the other Yeah but it's angle when it exits

01:40

also depends on the angle of the material Well those

01:44

changes in the angle of lighter called angular dispersion who

01:47

five dollar word since a square object has parallel sides

01:51

angles on entrance and exit are minimized and since it

01:56

also has perpendicular sides the right angles of the square

01:59

minimized dispersion for internally reflected light waves So the correct

02:04

answer is d and there we have it We can

02:07

see the solution with our own two eyes Well kind

02:10

of eyes need a little help with the angle of

02:12

refraction there And then we left our glasses somewhere So

02:14

likes a bit blurry right now but we think we

02:17

left him over in the all right Yeah i found 00:02:21.66 --> [endTime] him

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