What conclusion do you get from the fact that when an object is placed in the path of light, a shadow is formed behind the object?

Which property of light is illustrated by the fact that we cannot see around a corner?

State one property of light which is demonstrated by the working of a pinhole camera. 

Name a device which can be used to see things on the other side of a high wall (without having to climb over the wall).

State the difference between real images and virtual images.

Why is the image formed in a pinhole camera inverted?

The formation of pinhole images and shadows are possible only if _____ travels in a straight line path.