Ad
related to: converging lens focal length
Search results
Results from the WOW.Com Content Network
For a converging lens (for example a convex lens), the focal length is positive and is the distance at which a beam of collimated light will be focused to a single spot. For a diverging lens (for example a concave lens), the focal length is negative and is the distance to the point from which a collimated beam appears to be diverging after ...
The focal length is positive for converging lenses, and negative for diverging lenses. The reciprocal of the focal length, , is the optical power of the lens. If the focal length is in metres, this gives the optical power in dioptres (reciprocal metres).
For optics like convex lenses, the converging point of the light exiting the lens is on the input side of the focal plane, and is positive in optical power. For concave lenses, the focal point is on the back side of the lens, or the output side of the focal plane, and is negative in power.
The focal length of a lens. Converging lens Diverging lens y o: The height of an object from the optical axis. Erect object Inverted object y i: The height of an image from the optical axis Erect image Inverted image M T: The transverse magnification in imaging (= the ratio of y i to y o). Erect image Inverted image
It is equal to the reciprocal of the focal length of the device: P = 1/f. [1] High optical power corresponds to short focal length. The SI unit for optical power is the inverse metre (m −1), which, in this case, is commonly called the dioptre (symbol: dpt or D). Converging lenses have positive optical power, while diverging lenses have
A ray tracing diagram for a converging lens. A device that produces converging or diverging light rays due to refraction is known as a lens. Lenses are characterized by their focal length: a converging lens has positive focal length, while a diverging lens has negative focal length. Smaller focal length indicates that the lens has a stronger ...
Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!
f = focal length of lens where f > 0 for convex/positive (converging) lens. Only valid if the focal length is much greater than the thickness of the lens. Thick lens
Ad
related to: converging lens focal length