Using Reflect Views with
Object/Image Sticks
These ReflectViews are resource material to support
parts of
STAO’s ScienceWorks
Grade 10 Optics
The following are excerpts from
L2 Q1 Image Location (Slides 11-26 of 26)
L2 Q2 Seeing Images (Slides 6-10, & 25 of 58)
L11 Index of Refraction (Slides 12-22, of 34)
And
One Way Mirror Shoe Box (Slides 1-10)
Question 1)
Where does the Image
appear to be located in a
Plane Mirror?
Image Location Lab
Image Location Lab
1) Place an Object in front of the MIRA on a sheet of
scrap paper.
2) Notice you can see a reflection of the Object in the
MIRA. If you use an Object/Image Stick you even see
the word Image in the reflection.
3) Place an Image locator (a second Object/Image Stick)
behind the MIRA.
4) You can see the Image locator through the MIRA. If
you use an Object/Image Stick, turn it around so that
you can see the word Image through the MIRA
5) Move the Image locator until it appears to overlap the
Image.
6) Trace the location of the Object.
7) Trace the location of the Mirror.
8) Trace the location of the Image (Image locator).
9) Move the Object twice (2X’s) more
10) Trace all Object and the Image locations
11) Be careful to keep the MIRA in the same place.
12) You should have a piece of
paper that looks similar to
O1
O2
I2
O3
13) Draw a line from the centre
of the Object to the centre
of the Image so you have
have a piece of paper that
looks similar to
O1
I3
O2
O3
14) What are two observations that can be used to
predict the position of the Image in a mirror?
15) Try the Bulls Eye activity
I1
I2
I1
I3
Your Turn
Do the Image Location Lab
Image Location Lab
Answers Follow
1) What are two observations that can be used to predict the
position of the Image in a mirror?
a) The distance from the Object to the Mirror is
the same as the distance from the Image to the
Mirror.
b) The line connecting the Object and Image
intersects the Mirror at 90 °
2) Use your observations to show where, and then describe how,
you would place a MIRA or Reflect-View so that the tip of the
arrow always appears to hit the Bulls Eye
a) Draw a line connecting the Arrow Tip and the
Bulls Eye (Object & Image)
2) Use your observations to show where, and then describe how,
you would place a MIRA or Reflect-View so that the tip of the
arrow always appears to hit the Bulls Eye
b) Place the Mirror in the middle of the line
2) Use your observations to show where, and then describe how,
you would place a MIRA or Reflect-View so that the tip of the
arrow always appears to hit the Bulls Eye
b) Place the Mirror in the middle of the line
and rotate it 90° to the line.
2) Use your observations to show where, and then describe how,
you would place a MIRA or Reflect-View so that the tip of the
arrow always appears to hit the Bulls Eye
Question 2)
From Viewing Images in Plane Mirrors L2Q2SeeingImage
How can the light rays appear to go
through an opaque Mirror?
In your notes you see this graphic .
Place a MIRA or Reflect View on it as shown .
Place a MIRA or Reflect View on it as shown .
Place a MIRA or Reflect View on it as shown .
Notice you can see an Image in the “Mirror” If you
look over the top, behind the Mirror there is no
Image. The light rays must come from the Object
and reflect off the Mirror . How do they do this?
Reality Check
Use a MIRA or Reflect View to see if the Predicted
Image you drew and the real Image, overlap.
If they do the light rays must reflect as predicted
See-Through-Loo
From L11 Index of Refraction
Inside View
Outside View
This is a picture of a public toilet in Switzerland that's
made entirely out of one-way glass. No one can see you in
there, but when you are inside, it looks like you're sitting in
a clear glass box. http://www.snopes.com/photos/arts/toilet.asp
7) What does this have to
do with Refraction?
See-Through-Loo
Inside View
Whenever light passes
from one medium to
another it partially
refracts and partially
reflects.
Outside View
7) What does this have to
do with Refraction?
See-Through-Loo
Inside View
Whenever light passes
from one medium to
another it partially
refracts and partially
reflects.
Outside View
7) What does this have to
do with Refraction?
See-Through-Loo
Did you notice the
reflected ray in the
activity?
Inside View
Whenever light passes
from one medium to
another it partially
refracts and partially
reflects.
Outside View
Partial reflection /
refraction also
occurs in windows.
Part of the light
striking the window
refract through and
part reflects back into
the room
If there is a difference between light brightness
on either side of a window, the light from the
bright side will refract strongly through and
reflect more strongly back into the room.
The person in the room will see a strong reflection
of themselves compared to the image refracted
from the other side
If there is a difference between light brightness
on either side of a window, the light from the
bright side will refract strongly through and
reflect more strongly back into the room.
The person in the room will see a strong reflection
of themselves compared to the image refracted
from the other side
If one side of a window is dark, the light from
the bright side will refract strongly through and
reflect strongly back into the room.
The person in the room will only see a reflection
of themselves and nothing refracted from the
other side. In this case, the Girl sees the Boy.
The Boy sees his reflection
If one side of a window is dark, the light from
the bright side will refract strongly through and
reflect strongly back into the room.
The person in the room will only see a reflection
of themselves and nothing refracted from the
other side. In this case, the Boy sees the Girl.
The Girl sees her reflection
If glass is partially coated with a metal like
aluminum or silver, the partial reflection is
strengthened so that the difference in light
intensity is not as important.
This is the principle of a one way mirror
Check out the One Way Mirror Shoe Box
See-Through-Loo
Inside View
Outside View
Inside the “Loo” is dark so that there is little light
to refract out. Note the weak reflection from
inside.
Outside the “Loo” is bright so there is lots of light
to reflect back and refract inside.
One Way Mirror Shoe Box
Materials
You need;
Utility knife
Shoe box (black or dark colours work best)
Cardboard
Reflect-View (best) but MIRA will work
1) Cut an “I” slit in the middle of both sides of a shoe
box.
2) Then cut a viewing hole in both ends
3) Put a Reflect-View in the “I” slit. The top and
bottom of the “I” allows the Reflect-View to slide in
more easily.
3) Put a Reflect-View in the “I” slit. The top and
bottom of the “I” allows the Reflect-View to slide in
more easily.
4) Cut a two holes in the lid as shown. These are to let
light into one chamber of the box, or the other, or
both.
5) Place the lid on the top and view a partner while
sliding a cover over one light transmitting hole then
the other.
5) Place the lid on the top and view a partner while
sliding a cover over one light transmitting hole then
the other.
6) A dark, opaque cloth over both you and your
partners head improves the effect. It is important
that there is very little light on the “dark side”
6) A dark, opaque cloth over both you and your
partners head improves the effect. It is important
that there is very little light on the “dark side”