1-4 Shadow (1.2)

Shadow (p. 22)
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Slide 1: Tekstslide
NatuurkundeMiddelbare schoolhavoLeerjaar 2

In deze les zitten 20 slides, met interactieve quizzen, tekstslides en 1 video.

time-iconLesduur is: 50 min

Onderdelen in deze les

Shadow (p. 22)
Bluetooth 
- On


Stationary
- Books
- Pen and pencil
- iPad


Report
- NO


Lessonup
- Yes
Bags in
the cuboard
Phones in the phone holder

Slide 1 - Tekstslide

Lesson goals:
  • Explain what light rays, partial shadow and full shadow is.  
  • Name the types of light beams and explain their uses:
      Divergent light beams 
      parallel light beams. 
  • Explain what a point source is. 

Slide 2 - Tekstslide

Light rays
  • Light rays move in straight 
       lines. 
  • Light rays only become vissible when they reflect off other objects, e.g.  During a lightshow, there needs to be smoke particles present in the air otherwise you dont see the laser beams.
  • A shadow forms when objects block light rays. 

Slide 3 - Tekstslide

Why is the sky blue?
  • Light form the sun is scattered 
        when it enters our atmosphere. 
  • This is called diffuse light. 
  • Blue is scattered more than  
       the other colours, and 
       therefore the more prominent colour.

Slide 4 - Tekstslide

Activity 8 (p. 30)
We do it differently
Use the fluorescent tube above you as lightsource, and your hand as an object
timer
2:00

Slide 5 - Tekstslide

Types of shadow
  • Partial shadow: A shadow that 
       receives light from more lightsources.
  • Full shadow: The light from all lightsources is stopped by the lit-up object.
  • For work spaces sharp shadows are unpleasant. That is why they are usually equipped with fluorescent tube lighting. 

Slide 6 - Tekstslide

Slide 7 - Tekstslide

Types of light beams
o Point source: Light comes from one place.
o Divergent light beam: 
    Light rays spread out.  
                                 (point source)
o Parallel light beam: 
    Licht rays dont spread out. 
                                      (laser)

Slide 8 - Tekstslide

With a divergent light beam all light comes from one point.
A
True
B
False

Slide 9 - Quizvraag

With a parallel light beam the shadow is always the same size as the object.
A
True
B
False

Slide 10 - Quizvraag

With a divergent light beam the shadow is the same size as the object.
A
True
B
False

Slide 11 - Quizvraag

You can never see light rays.
A
True
B
False

Slide 12 - Quizvraag

Partial shadow is the area where no light reaches.
A
True
B
False

Slide 13 - Quizvraag

How can we see light?
A
Reflection
B
Diffusion
C
Parallel
D
Dispersion

Slide 14 - Quizvraag

Explain why the sky is blue.

Slide 15 - Open vraag

Which part of the drawing is partial shade?
A
B
C
A
A
B
B
C
C

Slide 16 - Quizvraag

Slide 17 - Video

What kind of light beam was used to make this presentation?
A
divergent light beam
B
parallel light beam
C
convergent light beam

Slide 18 - Quizvraag

Do the following questions:
20 t/m 23 (blz. 24)
In your writingbook
Rules: 
- 10 minutes
- No talking

Finished early: search more shadow theatre on youtube, and see what you can say about the kind of light beam they use.
timer
10:00

Slide 19 - Tekstslide

In a nutshell:
  • You can only see light when it is reflected. 
  • Shadows apear when light is blocked by objects. Partial shade forms when some light is blocked, but still other light raches the area where the shadow forms.  
  • With a divergent light beam, light spreads out
       and with a parallel light beam 
       the light rays run parallel to each other.

Slide 20 - Tekstslide