1-7 Mirror images (1.3)

• Natuurkunde
• Middelbare school
• havo
• Leerjaar 2

Recap 6.2

Direct, indirect and diffuse

Light and shadow

Light always travels in a straight lines, called rays.

When something blocks a ray of light there will from a shadow behind it

When only a part of the light gets blocked a penumbra is formed (only a bit shadowy)

When all of the light is blocked an umbra is formed (full shadow)

The last ray of light which can pass by an object is called an edge ray, you need to use these in drawings to determine where and how shadows are formed.

Do the recap exercise

Mirror images 6.3

Lesson goals:

Explain what the following terms mean:

• Mirror image; 
• Diffuse reflection; 
  
• Specular reflection;
  
• Field of view in a mirror; 
• Blind spot

Activity 12 (p. 41)

Mirror image

The distance between the object and the mirror is the same as the distance between the mirror image and the mirror. 

Where is the mirror image?

1. Under the water
2. On the water
3. On top of the water

Where is the mirror image?

1. In front of the mirror
2. On the mirror
3. Behind the mirror

Draw the mirror image

Draw the mirror image by putting the red dot in the right spot

Diffuse reflection

A white wall will reflect light in all different directions because of its rough surface. This is called diffuse reflection.

Specular reflection

How can you see with a white wall that it is reflecting light?

1. It is light
2. It is white and not black
3. Due to specular reflection

What do you know about the distance between the mirror image and the mirror, and the object and the mirror?

1. Mirror image is further away
2. The object is further away
3. The distance is the same

What type of reflection is this?

1. Diffuse
2. Specular

What kind of reflection is this?

1. Diffuse
2. Specular

The reflection that you see in a window, is on the window itself.

1. True
2. False

The mirror image is always behind the mirror.

1. True
2. False

Field of view in a mirror

• Field of view in a mirror is the area visible in a mirror.  
  
• The blind spot is an area not visible for a driver. 
  
• Extra mirrors that are convex 

       are placed on the sides of 
       lorries to make the blindspot 
       smaller. .

If you can see someones eyes in a mirror, then he/she can see you also.

1. True
2. False

In a nutshell:

• The mirror image always forms behind the mirror. 
• Reflection in all directions is called diffuse reflection. 
• A plane surface will result in a specular reflection. 
• The field of view in a mirror is the

        area that is visible for a driver

        in his mirrors.

• The blind spot is the area that

        a driver can not see. Not in his

       mirrors, nor in his line of sight.