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AP Physics 2: 1.4 Waves
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AP Physics 2: 2.5 Waves 4 Views


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Description:

AP Physics 2: 2.5 Waves. Which of the following statements is true?

Language:
English Language

Transcript

00:00

Thank you here's your shmoop toos your brought to you

00:05

by contact lenses which help us see the world clearly

00:09

except for when they slide apart eyeballs and feel like

00:11

they have lodged in our brain And we have to

00:13

spend an hour trying to dig them out All right

00:16

well there are a few reasons Contact lenses They're difficult

00:18

to see when placed in saline solution For one the

00:22

person who just took him out is well blinder than

00:25

usual Some other possibilities Heir listed below Which of the

00:28

following statements is true Select too Well ah yes it's

00:37

your favorite morning ritual sloshing our finger in the contacts

00:41

case when we're half blind half a way we can

00:43

and trying to find the lenses are but let's take

00:45

a closer look at this question We can seek contact

00:47

lenses when we're putting them in because in air they've

00:51

been the light that hits him so we can see

00:53

where the edges are Well in saline solution the borders

00:57

aren't is easy to see that's not because the radio

01:00

of curvature change though that's just part of the lenses

01:04

shape and it's not affected by the environment So a

01:07

is a correct answer now to determine if the effect

01:10

of focal length is longer Well let's look at the

01:13

lens makers equation when we have a lens in air

01:17

with lens makers equation shows that the reciprocal of the

01:20

focal length equals the refractive index of the lens minus

01:24

one times the difference between the reciprocal of the radius

01:28

of lens side closest to the light source and the

01:31

radius of the lens side farthest from the light source

01:35

All right in the air these numbers won't change the

01:37

ready I remain the same refractive index remains the same

01:41

air is air so that's not going to change But

01:45

when a lens isn't in the air and it's in

01:47

a different medium like oh say saline solution while then

01:50

the equation changes instead of the refractive index minus one

01:55

we use the refractive index of the lens over the

01:58

refractive index of the medium The lens is in minus

02:01

one because pretty much everything has a refractive index larger

02:05

than one result of this new equation will show a

02:07

longer focal point than for a lens in the air

02:11

So be is also correct As we can see in

02:14

these equations The refractive index of lens doesn't change no

02:17

matter what material it's in that's something that's inherent in

02:20

what the lens is made up It's not like dunking

02:23

an oreo and milk and watching it get all soft

02:26

and gooey and stuff i'm sorry we're feeling snacky here

02:29

All right Well the refractive index stays the same in

02:32

air water oil or well anything Soc is incorrect and

02:36

transparency is also an inherent quality The environment that the

02:40

lenses in doesn't change the lens itself So d yeah

02:44

that's wrong too if you're like Us and blind as

02:47

a bat without your contacts Well next time you stumble

02:49

into the bathroom in the morning and try to regain

02:51

the power of sight Remember that it's physics that it's

02:53

making it so hard to get those stupid little lenses 00:02:57.37 --> [endTime] No sorry we're not morning people

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