Optical Devices - Lecture Slides | PHYS 212, Study notes of Physics

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Physics 212 Lecture 27, SlidePhysics 212 Lecture 27, Slide

Physics 212

Physics 212

Lecture 27

Lecture 27

Optical Devices

Optical Devices

Physics 212 Lecture 27, SlidePhysics 212 Lecture 27, Slide

Music

Who is the Artist? Who is the Artist?A) A)

Jefferson AirplaneJefferson Airplane

B) B)

Grateful DeadGrateful Dead

C) C)

Moby GrapeMoby Grape

D) D)

The DoorsThe Doors

E) E)

CreamCream

What a Long Strange Trip It What a Long Strange Trip It

’ ’

s Beens Been

There is (or was) nothing like a Dead concert! There is (or was) nothing like a Dead concert!

Need I say anything more? Need I say anything more?

Physics 212 Lecture 27, SlidePhysics 212 Lecture 27, Slide

Cause he gets up in the morning, and he goes to work at nine, Cause he gets up in the morning, and he goes to work at nine,

And he comes back home at five And he comes back home at five

thirty, gets the same train every time.thirty, gets the same train every time.

Cause his world is built on punctuality, it never fails. Cause his world is built on punctuality, it never fails.

CHORUS:

CHORUS:

And he's oh, so good, and he's oh, so fine, And he's oh, so good, and he's oh, so fine,

And he's oh, so healthy, in his body and his mind. And he's oh, so healthy, in his body and his mind.

He's a well respected man about town, doing the best things so c He's a well respected man about town, doing the best things so c

onservatively. onservatively.

And his mother goes to meetings, while his father pulls the maid And his mother goes to meetings, while his father pulls the maid

And she stirs the tea with councilors, while discussing foreign And she stirs the tea with councilors, while discussing foreign

trade, trade,

And she passes looks, as well as bills, at every suave young man And she passes looks, as well as bills, at every suave young man

CHORUS

CHORUS

And he likes his own backyard, and he likes his fags the best, And he likes his own backyard, and he likes his fags the best,

Cause he's better than the rest, and his own sweat smells the be Cause he's better than the rest, and his own sweat smells the be

st, st,

And he hopes to grab his father's loot, when Pater passes on. And he hopes to grab his father's loot, when Pater passes on.

CHORUS

CHORUS

And he plays at stocks and shares, and he goes to a Regatta, And he plays at stocks and shares, and he goes to a Regatta,

He adores the girl next door, and he's dying to get at her, He adores the girl next door, and he's dying to get at her,

But his mother knows the best about the matrimonial stakes. But his mother knows the best about the matrimonial stakes.

CHORUS

CHORUS

Physics 212 Lecture 27, SlidePhysics 212 Lecture 27, Slide

Your thoughts:

Your thoughts:

angular magnification, two lens systems with the second inside t angular magnification, two lens systems with the second inside t

he he

focal length. focal length.yay yay

last lecture! last lecture!

i'll i'll

write my haiku nowwrite my haiku now

two twelve is over two twelve is overno more gauss or e and m no more gauss or e and mjust one more week left just one more week left

There are so many formulas and derivations, what do we really ha There are so many formulas and derivations, what do we really ha

ve to know? ve to know?

For next year the students should have their choice of prelectur For next year the students should have their choice of prelectur

e voicing, e voicing,

like Microsoft Sam, Vanilla Ice, or Mr. T. ("I pity like Microsoft Sam, Vanilla Ice, or Mr. T. ("I pity

tha tha

fool who don't knowfool who don't know

that far that far

sighted people need converging sighted people need converging

lens glasses.") lens glasses.")

Aaand Aaand

how!how!

Material seems easy, but its really hard to keep track of what'sMaterial seems easy, but its really hard to keep track of what's

going on. going on.

Like when its virtual, real, focal point...I get lost easily.Like when its virtual, real, focal point...I get lost easily.

Physics 212 Lecture 27, SlidePhysics 212 Lecture 27, Slide

Executive Summary

Executive Summary

Mirrors:

Mirrors:

S

S

2f

2f

real real

inverted inverted

smaller smaller

f f

2f

2f

S > f

S > f

real real

inverted inverted

bigger bigger

f

f

S > 0

S > 0

virtual virtual

upright upright

bigger bigger

f f

S

S

virtual virtual

upright upright

smaller smaller

concave concave

convex convex

S

S

f

S

M

S

Physics 212 Lecture 27, SlidePhysics 212 Lecture 27, Slide

S

S

f

Simple rules:

Simple rules:

f

f

is

is

ve

ve

for converging lens or mirror,

for converging lens or mirror,

ve

ve

for diverging!

for diverging!

S

S

is

is

ve

ve

upstream of lens or mirror,

upstream of lens or mirror,

ve

ve

downstream

downstream

3) Combine elements upstream to downstream.

3) Combine elements upstream to downstream.

Its always the same:

Its always the same:

fS

S

S

f

S

M

S

fS

S

S

f

Note: Drawing principal rays for more than one element is tricky Note: Drawing principal rays for more than one element is tricky

its best just to use above rules !its best just to use above rules!

You will get some practice when Gary does a problem You will get some practice when Gary does a problem

Physics 212 Lecture 27, Slide Physics 212 Lecture 27, Slide

10

Far

Far

sighted

sighted

Fix with converging lens Fix with converging lens

Physics 212 Lecture 27, SlidePhysics 212 Lecture 27, Slide

11

Near

Near

sighted

sighted

Physics 212 Lecture 27, Slide Physics 212 Lecture 27, Slide

13

0

70 60 50 40 30 20 10

Two people who wear glasses are camping. One of them is Two people who wear glasses are camping. One of them isnearsighted and the other is farsighted. Which person's nearsighted and the other is farsighted. Which person'sglasses will be useful in starting a fire with the sun's rays? glasses will be useful in starting a fire with the sun's rays? A) the farsighted person's glasses A) the farsighted person's glassesB) the nearsighted person's glasses B) the nearsighted person's glasses

a far sighted person takes the light and a far sighted person takes the light andfocuses it so that a person can see closer, focuses it so that a person can see closer,which brings all the light to one point, which brings all the light to one point,which would help start a fire. which would help start a fire.

I'm nearsighted and my glasses are I'm nearsighted and my glasses areuseless as far as starting fires goes. useless as far as starting fires goes.

Physics 212 Lecture 27, Slide Physics 212 Lecture 27, Slide

14

0

60 50 40 30 20 10

If he stands 14 cm away from the mirror, the If he stands 14 cm away from the mirror, the

persons image will appear 14 cm behind the persons image will appear 14 cm behind the

mirror. Thus, the image will be 28 cm away. mirror. Thus, the image will be 28 cm away.

A person with normal vision (near point 28cm) is standing in fro A person with normal vision (near point 28cm) is standing in fro

nt of a nt of a

plane mirror. What is the closest distance to the mirror the per plane mirror. What is the closest distance to the mirror the per

son can son can

stand and still see himself in focus? stand and still see himself in focus? A) 14cm A) 14cmB) B)

28cm 28cm

C) C)

56cm 56cm

d

dddd

θθθθ

r r

r r

θθθθ

iiii

Physics 212 Lecture 27, Slide Physics 212 Lecture 27, Slide

16

A parallel laser beam of width A parallel laser beam of width

w w

11

is incident on a two lens system is incident on a two lens system

as shown below. Each lens is converging. The second lens has a as shown below. Each lens is converging. The second lens has alarger focal length than the first ( larger focal length than the first (

f f

22

f f

1 1

). What does the beam look). What does the beam look

like when it emerges from the second lens? like when it emerges from the second lens? A) A)

The beam is converging The beam is converging

B) B)

The beam is diverging The beam is diverging

C) C)

The beam is parallel to the axis with a width < w The beam is parallel to the axis with a width < w

1 1

D) D)

The beam is parallel to the axis with a width = w The beam is parallel to the axis with a width = w

1 1

E) E)

The beam is parallel to the axis with a width > w The beam is parallel to the axis with a width > w

11

5 0

35 30 25 20 15 10

Since the beam will converge to the focal point of f Since the beam will converge to the focal point of f

11

which is also the focal point of f which is also the focal point of f

2 2

, so the emerge , so the emerge

light will be parallel, and since f light will be parallel, and since f

2 2

is larger that f is larger that f

11

, the , the

width is grater than w width is grater than w

1 1

CD CD

Physics 212 Lecture 27, Slide Physics 212 Lecture 27, Slide

17

The Large Synoptic Survey Telescope

The Large Synoptic Survey Telescope

Physics 212 Lecture 27, Slide Physics 212 Lecture 27, Slide

19

Physics 212 Lecture 27, Slide Physics 212 Lecture 27, Slide

How to make a big telescope mirror

How to make a big telescope mirror

52,000 lbs of borosilicate glass when filled 52,000 lbs of borosilicate glass when filled