opticsreview2013 - sharpschoolwwphs.sharpschool.com/userfiles/servers/server_10640642...formation of...
TRANSCRIPT
6/6/13
1
6/6/13
2
$100
$200
$300
$400
$500
$100
$200
$300
$400
$500
$100
$200
$300
$400
$500
$100
$200
$300
$400
$500
$100
$200
$300
$400
$500
$100
$200
$300
$400
$500
Draw a ray.
How long do you have to wait to see in the dark?
6/6/13
3
Never will be able to see,
nothing emitted
Describe the conditions
necessary to see light
Has to reflect off an object and into your eyes
Draw the light rays emitted from one point on a candle.
How does a pinhole work? Draw the
object and image.
6/6/13
4
What causes the formation of
shadows?
When light shines on an object, some of the rays may be stopped while others pass on in a straight-line path
What is the difference between a shadow and a semi-
shadow?
Shadow- clearly defined
Semi-shadow- fuzzy, light can pass
Draw the shadow. Is it a shadow or a
semi-shadow?
6/6/13
5
Shadow Draw the shadow. Is it a shadow or a
semi-shadow?
Semi-shadow What is an eclipse? Provide an example
Solar eclipse: moon passes between earth
and sun
Lunar eclipse: earth passes between sun
and moon
What is the law of reflection?
6/6/13
6
Angle of incidence = angle of reflection
What type of image do plane
mirrors produce?
Virtual How big a mirror
do you need to see your entire body?
Include a ray diagram.
A mirror half your height (diagram on
board) What is the
normal? Why is it so important?
6/6/13
7
Normal = perpendicular to the surface; rays reflect
about the normal
A 50 cm dog stands 3 m from a plane mirror
and looks at its image. Draw a ray
diagram for the dog. Describe the image.
Virtual, same size, same distance.
Diagram on board
What type of image can a concave
mirror form?
Real or Virtual depending on
location in relation to focal point
Where is the focal point located for a
convex mirror? What type of image is always formed?
6/6/13
8
Behind the mirror, virtual image
What type of mirror is this? Why is there a
warning?
Convex, diverging light increases vision but decreases size of car
Draw a ray diagram. Describe the image.
See board. Real, reduced, inverted
Draw a ray diagram. Describe the image.
6/6/13
9
See board.Virtual, magnified, upright
What is refraction?
The bending of light
Describe how light bends as it changes
mediums
Bends towards the normal if entering a more dense medium, bends away from the normal if entering less
dense medium
Draw the refracted rays
6/6/13
10
Diagram on board How do rainbows form? Draw a ray
diagram!
Different wavelengths of
colored light refract differently, becomes
trapped
Why does the road look hazy on a hot summer day? Draw a ray diagram.
Hot air different density than cold air, refracts more. Diagram on board
6/6/13
11
Why is it dangerous to stare into the
sun?
A lot of light moving through a small
opening and being concentrated on the
retina, burns the retina
What is accommodation?
Adjustment of lens for near/far objects
What does it mean to be nearsighted? Draw a ray
diagram. Cannot see far objects
6/6/13
12
What does it mean to be farsighted?
Draw a ray diagram.
Cannot see close objects.
What type of lens corrects for near
sightedness? For far sightedness? Why?
Concave- nearsighted (diverges light)
Convex- farsighted (converges light)
Mirrors Why is it when you look at your face in a spoon it is upside down and smaller? How can you position yourself so the image of your face is larger when looking at the spoon? Draw ray diagrams to support your ideas.
A spoon behave as both a concave and convex mirror, depending on the side. See board for diagrams.