Which body part tells us what we are seeing?

What is an example of a light source?

What does invisible mean?

What can take pictures of your bones?

What makes a shadow?

What would make a dark shadow?

What reflects all light?

Select if the picture is a natural or artificial light:

Select if the picture is a natural or artificial light:

Select if the picture is a natural or artificial light:

Select if the picture is a natural or artificial light:

What type of material is the following object:

What type of material is the following object:

What type of material is the following object: