ch 11 reflecting light off a plane mirror p. 313 types ...€¦ · e:\new school folder sept\new...

$: Ch 11 Reflecting Light off a Plane Mirror p. 313 Types ...€¦ · E:\New school folder sept\new Science 8 probe\ch 11 mirrors and Lenses\notes\2011 Ch 11 notes.docx Last printed$
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Ch 11 Reflecting Light off a Plane Mirror p. 313

Types of Mirrors (3)

1) Plane: flat fg 1 p. 313

law of reflection: the angle of incidence = the angle of reflection

incident ray (in): the ray (light beam) of light that travels to the reflecting surface

reflected ray: the ray of light that bounces off a reflecting surface

normal: a line drawn perpendicular (90°) from the point of incidence of the reflecting surface

angle of incidence: the angle between the incident ray and the normal

angle of reflection: the angle between the reflected ray and the normal

http://www.youtube.com/watch?v=IjIo8im38gA

Sec. 11.2 Reflecting Light off Surfaces

p. 316

Specular (regular) reflection:

light reflects off a smooth, shiny surface, flat

ex: fg 1a p. 316

often produces an image (picture)

ex: mirror, clear water, shinny metal

http://www.youtube.com/watch?v=Qr8exoX-uE0&feature=related


http://www.youtube.com/watch?v=Qr8exoX-uE0&feature=related


image appears behind the mirror, right-side up but backwards ex: fg 3 p. 317:

Diffuse Reflection:

light hits an irregular surface and is scattered in all directions → no image produced http://www.youtube.com/watch?v=y7xJ28ghzkI&feature=related

still obeys the angle of incidence = angle of refection law

fg 1b p. 316

do not see a reflection:

ex: looking into green

grass

diffuse reflection easier on eyes: ex: lamp shades, stucco roofs, frosted

bulbs

HW: Read 11.3

cyu 11.2

http://www.youtube.com/watch?v=y7xJ28ghzkI&feature=related


Ch 11 Reflecting Light off a Plane Mirror p. 313

________of Mirrors (3)

1) Plane: ________ fg 1 p. 313

law of __________: the angle of ______________= the angle of _____________

incident ray (in): the __________(light beam) of light that travels _________the reflecting surface

__________ray: the ray of light that _____________off a reflecting surface

___________: a line drawn perpendicular (90°) from the point of incidence of the reflecting surface

______of incidence: the angle between the incident ray and the ____________

angle of ___________: the angle between the ______________ray and the normal


Sec. 11.2 ___________Light off Surfaces

p. 316

_____________(regular) reflection:

light reflects off a _________, shiny surface,

flat ex: fg 1a p. 316

often produces an ___________(picture)

ex: mirror, clear water, shinny metal



image appears ____________the mirror, right-side up but ________________

ex: fg 3 p. 317:

_________Reflection:

light hits an______________surface and is ____________in all directions → ______image produced


still obeys the angle of incidence = angle of refection ___________

fg 1b p. 316

do _______ see a

reflection:

ex: looking into green

grass

diffuse reflection easier on eyes: ex: lamp ___________, stucco roofs,

frosted bulbs

HW: Read 11.3

cyu 11.2



Sec. 11.3 Describing Images p. 319

image: likeness of object (picture) fg 1 p. 319

ex: formed at back of eye

formed on a screen

optical device: produces an image

ex: overhead machine

Characteristics of Images: table 1 p. 320

1) Size: a) smaller then the object

b) larger then the object

c) same size as the object

2) Attitude: a) upright (right side up)

b) inverted (upside down)

3) location of image (many possibilities)

a) on the side of the lens opposite the object

b) closer to the optical device then to the object

c) behind mirror, in front of mirror, etc

4) Type: a) real image (can be placed on a screen)

b) virtual image (can be seen only by looking at or though an optical

device) ex: microscope

Lab 11.5 Curved Mirrors p. 323

Types of mirrors (3)

a) flat (plane)

b) convex: reflecting surface is on the outside of the curved surface

fg 1 p. 323 ex: back of a spoon

c) concave: reflecting surface is on the inside of the curved surface

fg 2 p. 323 ex: shaped like a cave, inside of the spoon

Sec. 11.6 Using Curved Mirrors 2 kinds p. 326

1) concave mirror fg 1 p. 326 shaped like a cave

principal focus: position where reflected parallel light rays come together

focal length: the distance from the principal focus to the middle of the mirror

principal axis: a line through the center of the mirror that includes the principal focus

focuses parallel light rays to principal focus fg 1 p. 326

when object is beyond the principal focus real image in front of the mirror can appear on

a screen


2) convex mirror fg 2 p. 326 shaped like a vex

principal focus: position where parallel light rays appear to reflect from: rays diverge (spread apart)

spreads light rays out virtual image behind the mirror can not be put on a screen

USING CONCAVE MIRRORS fg 3 p. 326

concave mirror gathers light from distant place & focuses it on: your eye, telescope, camera film, digital camera

fg 4 p. 327 concave cosmetic / make-up mirror

object is placed inside the principal focus of a concave mirror virtual, upright, farther from the mirror then the object,

enlarged image

Using Convex Mirrors

Curved surface reflects light from all parts of a room or area into your eye large field of view

Ex: fg 5a p. 327

Ex: surveillance mirrors

Ex: car side mirrors fg 6 p. 327

upright, smaller, farther away images


Sec. 11.3 Describing ____________ p. 319

image: ___________ of object (picture) fg 1 p.

ex: formed at back of eye

formed on a screen

_________device: produces an ________

ex: overhead machine

________________ of Images: table 1 p. 320

1) ________: a) smaller then the object

b) larger then the object

c) _________size as the object

2) __________: a) upright (right side up)

b) __________(upside down)

3) ___________of image (many possibilities)

a) on the side of the lens _____________the object

b) closer to the optical device then to the object

c) behind mirror, in front of mirror, etc

4) ____________: a) __________image (can be placed on a __________)

b) _________image (can be seen only by looking at or

though an optical _____________) ex: ____________

Lab 11.5 Curved Mirrors p. 323

Types of mirrors (3)

a) flat (___________)

b) __________: reflecting surface is on the outside of the curved surface

fg 1 p. 323 ex: ____________of a spoon

c) ____________: reflecting surface is on the inside of the curved surface

fg 2 p. 323 ex: shaped like a ________, inside of the spoon

Sec. 11.6 Using _________Mirrors 2 kinds p. 326

1) _____________mirror fg 1 p. 326 shaped like a cave

______focus: position where reflected parallel light rays come _______

focal __________: the ____________from the principal focus to the middle of the mirror

principal _______: a line through the center of the mirror that includes the principal ____

focuses parallel light rays to principal ______ fg 1 p. 326

when __________is beyond the principal focus ______image in front of the mirror can

appear on a ______


2) _________mirror fg 2 p. 326 shaped like a vex

principal _________: position where parallel light rays appear to _____________from: rays _________(spread apart)

________light rays out ________image behind the mirror can ______ be put on a screen

USING CONCAVE MIRRORS fg 3 p. 326

concave mirror gathers light from ______________place & focuses it on: your eye, telescope, camera film, digital camera

fg 4 p. 327 concave _________mirror

object is placed ________the principal focus of a concave mirror _________, upright, farther from the mirror then the

object, __________image

Using Convex Mirrors

Curved surface _________light from all parts of a room or area into your eye large ______of

view

Ex: fg 5a p. 327

Ex: ___________mirrors

Ex: car _________mirrors fg 6 p. 327

______, smaller, ________away images


summary: Image Characteristics of Different Mirrors p. 328 Demonstrate with giant concave mirrors

PLANE MIRROR CONCAVE

MIRROR (object is

closer to the mirror

than the principal

focus) fg 4 p. 327

CONCAVE

MIRROR (object is

farther from the

mirror then the

principal focus) fg 1

p. 326

CONVEX MIRROR

SIZE

Same size as object Larger than object Larger than the

object but becomes

smaller as object

distance increases

Smaller than object

ATTITUDE

Upright Upright Inverted Upright

LOCATION

Behind mirror

Same distance from

mirror as object

Behind mirror

Farther from the

mirror than the object

In front of mirror

Distance varies

depending on distance

of object

Behind mirror

Farther from the

mirror than the object

TYPE OF IMAGE virtual Virtual real Virtual

HW: cyu 11.6, 11.6


Sec. 11.7 p. 329 The Refraction of Light http://www.wonderhowto.com/how-to-make-coins-disappear-with-light-refraction-magic-trick-222281/

Refraction: The bending of light as it passes from one medium (substance) to another

medium http://www.youtube.com/watch?v=6JqFdkjGkEI&feature=related

ex: fg 1 light bends as it moves from one medium to another: water into air

distorted image http://www.youtube.com/watch?v=uoN4qg2hHQo&NR=1&feature=fvwp

http://science.discovery.com/videos/head-rush-disappearing-glass.html

Terms: fg 2 p. 329

incident ray: incomming light ray

normal: imaginary line that is 90° (perpendicular) to

the refracting surface

refracted ray: the ray of light that has changed direction

(bent) as it passed from 1 medium (material) to another

(different materials have different densities)

angle of incidence: angle between the incident ray and

the normal

angle of refraction: angle between the refracted ray

and the normal

Sec. 11.8 Refracting Light in Lenses p. 331

lens: curved, transparent device that refracts (bends) light

ex: fg 1 light reflects off pepper travels through lens refracts (magnifies) eyes

other examples: eyeglasses, contact lenses, camera lenses

Why? Speed of light differs in different

materials (densities)

change of speed produces a change of

direction (refraction) fg 2 p. 331

http://www.wonderhowto.com/how-to-make-coins-disappear-with-light-refraction-magic-trick-222281/

http://www.youtube.com/watch?v=6JqFdkjGkEI&feature=related

http://www.youtube.com/watch?v=uoN4qg2hHQo&NR=1&feature=fvwp

http://science.discovery.com/videos/head-rush-disappearing-glass.html


http://hyperphysics.phy-astr.gsu.edu/hbase/geoopt/raydiag.html

Designs of Lenses: (2 types) p. 332

1) convex: thick in middle, thin on outside

fg 3 p. 332

principal focus: the position where parallel

light rays come together

focal length: distance from the principal focus

to the center of the lens

light rays converge (come together)

2) concave: fg4 p. 333

-principal focus: the position where parallel rays

appear to come from

-light rays diverge (spread apart)

Sec. 11.7 p. 329 The ______________of Light



Refraction: The ___________of light as it passes from one ___________(substance) to

another medium

ex: fg 1 light ______________as it moves from one medium to another: water into

air ___________image

Terms: fg 2 p. 329

__________ ray:

incomming light ray

normal: ___________line that is 90° (perpendicular) to

the ____________surface

___________ray: the ray of light that has changed

direction (_____________) as it passed from 1 medium

(material) to another (different materials have different

densities)

___of incidence: angle between the __________ray and the

normal

angle of ___________: angle between the ________ray

and the normal

Sec. 11.8 Refracting Light in ___________ p. 331

lens: ____________, transparent device that refracts (bends) light

ex: fg 1 light reflects off pepper travels through lens refracts (______________) eyes

other examples: eyeglasses, ___________lenses, __________lenses

Why?________of light differs in ___________

materials (densities)

_________of speed produces a change of

direction (____________) fg 2 p. 331




Designs of Lenses: (2 types) p. 332

1) __________: thick in middle, thin on

outside fg 3 p. 332

principal ___________: the position where

_________light rays come _________

focal _________: distance from the principal

focus to the _______________of the lens

light rays ___________(come together)

2) ____________: fg4 p. 333

-__________focus: the position where parallel rays

___________to come from

-light rays _____________(spread apart)

ch 11 reflecting light off a plane mirror p. 313 types ...€¦ · e:\new school folder sept\new...

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