it is zero . Power = 1/focal length The focal length of a plane glass or mirror is infinite, therfore power is zero
When light passes through the glass plate, the light doesn't bent so the focal length becomes infinity. And we have power=1/focal length, so power remains zero.
Focaal length for plane mirror is 0
Power is ZERO Since power = 1/ focal length As focal length of plane mirror is infinity, its reciprocal is 0
It does not. For an explanation of "focal plane" see the question What is the focal plane?
Yes, but it will not be clearly resolved because it is not at the focal length. The same could be said for the image just outside the focal length. The further from the focal length the attempt is made to resolve the image, the poorer the resolution will become.
Are you sure about this? In my book, the only things to have focal lengths are lenses and other optical imaging systems.
The size (diameter) of a lens does not determine its focal length. The amount of curvature of the lens does. Citing a diameter for a lens doesn't help us find the focal length. Lenses are ground to specifications that allow short or long focal length. The more curved the lens, the shorter the focal length. You can see this if we specify a given curvature and then start to "flatten" the lens. The focal length will get longer and longer as the lens is flattened. When the lens is flat (has to curvature) the lense has an infinite focal length, just like a piece of flat glass.
focal length is measured in mm
Magnification = focal length of the objective/focal length of the eyepieceIncrease focal length of the eyepiece ===> decreasemagnification.
The focal length of a telescope is directly related to the magnification in that the longer the focal length, the more magnification you get from the telsceope. How the focal length of a telescope relates to the length of the telescope itself depends on the design of the telescope. In a refracting telescope, the focal length is approximately the length of the telescope. In a reflecting telescope, the focal length is roughly two time the length of the telescope.
FOCAL PLANEA plane perpendicular to the axis of an optical system and passing through the focal poit of the systemFOCAL POINTA point of convergence and divergnce of light and other radiations
A lens of short focal length has a greater power (than a lens of large focal length)
To get the focal length when the magnification is given, simply divide it by the focal length of the eyepiece.
A focal plane shutter is located just in front of the film or sensor at the lens focal plane (not surprisningly...). It is not located in the lens itself.
Simply put, convex lenses make things look bigger. That is obviously beneficial in a magnifying glass. Focal length indicates the distance from the lens that something should be to be in the best focus (or not inverted). Therefore, a small focal length is best for magnifying glasses which are typically used to look at things that are very close to you.
The magnification of the telescope image is(focal length of the objective) divided by (focal length of the eyepiece).The focal length of the objective is fixed.Decreasing the focal length of the eyepiece increases the magnification of the image.(But it also makes the image dimmer.)
The magnifying power of a telescope is the focal length of the scope in millimeters, divided by the focal length of the eyepiece in millimeters. Focal length of scope: 225cm=2250mm Focal length of eyepiece: 7.5mm 2250/7.5= 300X
You mean the focal length of the eye lens? When the source is far away the focal length is reduced. As the object comes nearby the focal length gets increased.
More the curvature of the eye lens, lesser the focal length is. Lesser the curvature, greater the focal length is
Infinity, as rays after refraction neither actually nor appears to meet.
Power is inversely related to the focal length. So convex lens of focal length 20 cm has less power compared to that having focal length 10 cm