Two things ...
Light can be focused (by a lens).
There are chemicals which are changed by the presence of light.
They are the same rules as are used by vision, but the chemicals are different.
Cecil Frank Powell has written: 'Nuclear physics in photographs' -- subject(s): Nuclear physics, Photography, Photography in nuclear physics, Radioactivity, Scientific applications 'The hydrogen bomb and the future of mankind'
the physics behind paper airplane is of aerodynamics
physics psychology photography physical education political science
There are several important things behind time lapse photography, but the key principle is that the capture of photography takes place over lapse of time different than being viewed. This period of chronological duration is the root of time lapse photography.
The concept behind photography is mainly just capturing the moment. Photographs are taken to treasure for many geneerations to come as they are something that one can look back at and recall that moment.
The math behind aircrafts is very complex gemoetry and physics.
Back lighting in photography is when the light source is behind the subject, creating a silhouette effect or highlighting the edges of the subject. Some examples of back lighting in photography include a sunset behind a person, a window with sunlight streaming through, or a light source directly behind a subject creating a halo effect.
Nuclear Physics
Maths and physics.
That depends on the specific toys.
Phenomenal, photography, photograph and physics to mention a few. For a complete list, see http://www.morewords.com/starts-with/ph/ .
Physics is simply the study of the properties of matter and energy. The physics behind a toaster is that the toaster conducts electricity to produce heat, toasting bread or whatever other food.