Assertion: lens's distance | /r/HasProperty | focal length
Facets:
value: for a thin lens in air
type: TRANSITIVE-OBJECT
value: similarly
type: DEGREE
Source sentences:
text: Similarly, the distance from the second lens to the rear focal point of the combined system is the back focal length (BFL):
text: For a thin lens in air, the distance from the lens to the spot is the focal length of the lens, which is commonly represented by f in diagrams and equations.
text: The distance from the front focal point of the combined lenses to the first lens is called the front focal length (FFL):
text: When a lens is a certain distance (its focal length) away from the film, distant objects, such as faraway mountains, are in focus.
text: The distance in air from the lens or mirror's principal plane to the focus is called the focal length .
text: Similarly, the distance from the second lens to the rear focal point of the combined system is the back focal length (BFL):
text: For a thin lens in air, the distance from this point to the lens is the focal length, though it is negative with respect to the focal length of a converging lens.
text: If you pass parallel light rays through a negative lens, they seem to spread out from a point behind the lens, the distance from this point to the centre line of the lens is the focal length; this is given a negative value, as it is on the opposite side of the lens from the focal point of a positive lens.
text: For a thin lens in air, the distance from this point to the lens is the focal length, though it is negative with respect to the focal length of a converging lens.
text: The distance from the center of the lens to the focal point is the focal length of the lens.
text: The distance from the center of the lens to the focal point is, again, the focal length of the lens.
text: For a thin lens in air, the distance from the lens to the spot is the focal length of the lens, which is commonly represented by f in diagrams and equations.
text: The distance from the front focal point of the combined lenses to the first lens is called the front focal length (FFL):