Because light can enter a lens from either side, a lens has a focal point on both sides. With mirrors, on the other hand, light only enters from one side, so they only have one focal point. the apex answer:
The centers of curvature of the two sides of the lens The material the lens is made from
no dip sherlock
There are two types of lenses - fixed focal and zoom lenses.
18-55mm focal lenses are very good lenses for the Samsung digital camera. Other good lenses for the Samsung digital camera are the 28-90mm and 35mm focal lenses.
Convex lenses have a focal point.
The material that the lens is made from.
An ellipse have two focal points.
Power (F)= 1/focal length (f) focal length f, is measured in meters the power, F, is in dioptres (D) In converging or convex lenses the power is positive In diverging or concave lenses, the power is negative :)
parafocal lenses are zoom lenses that preserve the focal plane for every magnification factor.
They can be any distance apart depending on the focal length and magnification.
It depends upon the type of lens. Some are long and some are short. Others are variable such as a zoom lens.
the foci (2 focal points) and the distance between the vertices.
It have a shorter focal length because there is more time for the light rays to come together
Lenses enable individuals to view objects. A Converging lens has a positive focal length, which facilitates the convergence of the exiting rays. While, diverging lenses have a negative focal length, which facilitates the divergence of the exiting rays.
because thick lenses have small focal length . this causes chromatic aberration. hence it can be minimised by increacing the focal length of lens or by using thin lenses which have high focal length.
As a thicker lens has more material to do bend the light further it it would have a shorter focal length
In elipses. The Sun is at one of the focal points of the elipse.In elipses. The Sun is at one of the focal points of the elipse.In elipses. The Sun is at one of the focal points of the elipse.In elipses. The Sun is at one of the focal points of the elipse.
We're going to assume that you mean "focal lengths".Camera lenses don't typically have very long focal lengths. The lenses with verylong focal lengths are the ones you see that look like a big tapered piece of pipesticking out on the front of the camera. Those are the extreme 'telephoto' lenses ...designed to blow up magnify (sorry) small objects in the distance. It's nearly impossibleto hand-hold the camera steady enough with such a lens, and you almost always seethem used with the camera mounted on a tripod for stability.Here's a somewhat-related fascinating and useful factoid:One focal length on the film = one radian (57.3 degrees) in the scene
1:Single Vision Lenses 2:Multi focal Lenses 3:Bifocal Lenses 4:Progressive lenses Source Vision Express India
The convex lenses are converging lens so when the curvature of the lens increases the focal length will decrease which helps when looking up close. A thin convex lens is for seeing things from a distant.
Are you sure about this? In my book, the only things to have focal lengths are lenses and other optical imaging systems.
At normal adjustment, the distance between the two lenses is equal to the sum of the focal lengths of each lens.
Wide-angle lenses have a short focal length. The focal character of my short story is a ten-year-old boy.
1) Simply, changing to diopters (inverse of focal length in meters), D1=5 and D2=-6.666... , then their difference is -1.666... which corresponds to F=-0.6m or -60cm.2) Using formula for two lenses: 1/F = 1/F1 + 1/F2 - d/(F1 * F2), where d = distance between lenses (here equal to zero), 1/F = 1/20 - 1/15 = -1/60; so F=-60 (cm).
Concave. With myopia, the focal point of the eye is in front of the retina. Concave lenses increase the distance of the focal point so that it lies on the surface of the retina.