What determines the field of view in a camera?

The field of view in a camera is primarily determined by the focal length of the lens and the size of the image sensor. Focal length refers to the distance from the lens to the image sensor when the subject is in focus and affects how much of a scene will be captured. A shorter focal length provides a wider field of view, allowing more of the scene to fit into the frame, while a longer focal length narrows the view, magnifying the subject at the center.

The size of the image sensor also plays a crucial role. Larger sensors can capture wider angles compared to smaller sensors when using the same focal length, thus directly influencing the field of view. This relationship between focal length and image sensor size is vital for understanding how a camera captures scenes effectively, making option B the correct choice in determining the field of view.