1. Angle of view is the measure of how much of the subject or a scene/view a lens can take in horizontally, vertically or diagonally. So it is important for a photographer to focus on a particular subject or a scene while capturing a photograph.
Using a shorter focal length or moving your camera farther away can help you capture more of a scene in one shot.
2. A photographer might be interested in exploring human beauty or have it as a source of inspiration for his work.
I find portraits of people, focusing on their eyes, very meaningful with a lot of things to be read from it.
3. There must be back light to take a silhouette picture i.e. the background must be lighter than the object.
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