Optics and Light. Presentation

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Louisa Nichols
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1 Opics and Ligh Presenaion

2 Opics and Ligh Wha comes o mind when you hear he words opics and ligh?

7 Wha is an opical illusion?

8 Opical illusions can use color, ligh and paerns o creae images ha can be decepive or misleading o our brains.

9 Opics and Ligh Brainsorm Ma: Wha do you know abou ligh?

10 Opics and Ligh Wha do we KNOW abou ligh?

11 Opics and Ligh Wha do we WANT o know abou ligh?

12 Elecromagneic Specrum The par we can see

13 Compare and Conras

14 Sources of Ligh Somehing ha produces ligh is called luminous. Things ha only reflec ligh are called non-luminous.

15 Luminous and Non-Luminous In your noes, record each iem in he char as luminous or non-luminous.

16 How Does Ligh Travel? Sraigh and Fas! Ligh ravels a km/s Tha is 8 imes around he world in 1 second!

17 How Does Ligh Travel? Sraigh Ligh ravelling in a sraigh line is called a ligh ray.

18 Conrolling Ligh There are 3 ways o conrol ligh. The firs is o block i. This creaes a shadow. To block ligh, you mus have somehing opaque.

19 Reflecing Ligh Wha happens when you shine ligh on a mirror? I is refleced!

20 Invesigaion: Reflecion

21 Invesigaion: Reflecion 1. Hold your mirror wih one hand and poin i a he ceiling. 2. In your oher hand, ake your ligh and wihou urning i on, poin i a he mirror. Can you predic where your ligh will reflec o? Try i!

22 Reflecing Ligh Reflecing ligh is predicable and always follows he same rules. Because we know i ravels in a sraigh line and always reflecs he same way, we can say here is a Law of Reflecion.

23 Law of Reflecion Inciden Ray (Incoming Ray) Angle of Incidence Normal Angle of Reflecion Refleced Ray Reflecive Surface Angle of Incidence = Angle of Reflecion AI = AR

24 Law of Reflecion Normal 40 deg.? Reflecive Surface If he angle of incidence is 40 degrees, wha will be he angle of reflecion?

25 Law of Reflecion Normal 55 deg. Reflecive Surface Wha would he angle of incidence and he angle of reflecion be?

26 Exploraion: Aluminum Foil Look closely ino he shiny side of your aluminum foil. Wha do you see?

27 Exploraion: Aluminum Foil Genly crumple your aluminum foil and hen open i up again. Look a yourself in he shiny side. Now, wha do you see?

28 Types of Reflecion When you look ino a mirror (a smooh reflecive surface), he reflecion is very clear. I is a clear or specular reflecion.

29 Types of Reflecion When you look a a rough surface, he reflecion is no clear. I is a diffuse reflecion.

30 Silly Mirrors Have you ever looked in a silly mirror a a carnival or fair? Wha did you look like?

31 Concave and Convex Mirrors A mirror ha is curved inwards, like a cave, is called concave.

32 Concave and Convex Mirrors A mirror ha is curved inwards, like a cave, is called concave. A mirror ha is curved ouwards, or makes a bulge, is called convex.

33 Invesigaion: Concave and Convex Reflecions

34 Concave and Convex Reflecions

35 Concave and Convex Reflecions

36 Concave Reflecions When you look ino a concave mirror, if you are beyond he focal poin, your reflecion will appear upside down!

37 Convex Reflecions When you look ino a convex mirror, hings appear smaller han hey are. The focal poin in a convex reflecion is behind he mirror we say i is virual!

38 Toal Inernal Reflecion Demonsraion

39 Toal Inernal Reflecion Toal inernal reflecion occurs when ligh srikes he boundary of a medium and is refleced.

40 Toal Inernal Reflecion FiberOp or Fiber Opics uses he concep of oal inernal reflecion o deliver informaion o our homes and businesses all around he world.

41 Conrolling Ligh The hird way we can conrol ligh is o bend or refrac i.

42 Invesigaion: Pencil Problems Invesigaion: Floaing Coin

$Refracion When ligh ravels from a$ of a differen densiy, he ligh ray is

43 Refracion When ligh ravels from a medium of one densiy o anoher medium of a differen densiy, he ligh ray is ben or REFRACTED. normal Angle of refracion

44 Refracion Analogy: If you are driving down he road and he ire of your car caches he gravel shoulder, wha happens?

45 Refracion Analogy: If you are driving down he road and he ire of your car caches he gravel shoulder, wha happens? The vehicle is pulled ino he shoulder and slows down.

$Refracion The same hing happens when lighs rays ravel from$

46 Refracion The same hing happens when lighs rays ravel from one medium o anoher. This is why he pencil appears broken.

$Refracion The beam of ligh ravels from he air o he waer, reflecs off he pencil, back hrough he waer,$

47 Refracion The beam of ligh ravels from he air o he waer, reflecs off he pencil, back hrough he waer, ino he air and hen o your eye. By his ime, he ligh has been ben wice and i makes he pencil appear separaed.

48 Refracion The coin appears o rise for he same reason. As ligh rays reflec off he coin and hrough he waer, he beam is ben enough ha is able o reflec o your eye.

49 Seeing Colour Ligh is only a small par of a large specrum called he Elecromagneic Specrum. I is he par we can see. Whie ligh is acually made up of 7 colours we can see. Red Orange Yellow Green Blue Indigo Viole

$A prism refracs ligh and he whie ligh is broken$

50 Seeing Colour In order o see hese colours, we need a prism. A prism refracs ligh and he whie ligh is broken down ino is colours.. Each colour has is own wavelengh Each colour has is own wavelengh.

51 Film Clip: Sudy Jam: Ligh

52 Exploraion: Colour Filers

53 Colour Filers When you look a hrough a colour filer, hings appear o be ha colour. Why?

54 Colour Filers The filer only allows ha colour hrough so ha is he only colour you are able o see!

55 Black & Whie Black and Whie are wo unique colours. Firs, black is really a lack of colour. Black pigmens absorb all of he colours of he visible specrum and so we don see any colours.

56 Black & Whie Whie reflecs all colours of he specrum. So all he colours reflec ogeher making somehing appear whie.

57 Combining Colour Combining colours creaes new ones! + = + = + =

58 Lenses A lens is a polished piece of ransparen maerial wih a leas one curved side. There are many differen ypes bu we will be focusing on convex lenses.

59 Invesigaion: Convex Lenses

60 Convex Lenses Convex lenses can be used o focus ligh and hey magnify. This makes hem very useful!

61 Research Projec: Opical Technologies

62 Research Projec: Opical Technologies Microscopes The Hubble Telescope Conac Lenses Eye Glasses The human eye Lasers Camera Laser range finder CDs Fiber Opics Specroscope

63 Elecromagneic Specrum The elecromagneic specrum includes all he wavelenghs of ligh boh seen and unseen.

64 Elecromagneic Specrum Shorer wavelenghs are he more energeic ligh. Alhough we are no able o see hese wavelenghs, we are able o use many of hem for oher uses..

65 Opics and Ligh: Review

Light and all its colours

Light and all its colours Hold a CD to the light You can see all the colours of the rainbow The CD is a non-luminous body It is reflecting white light from the sun Where do the colours come from? Truth