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Why should the lens of a normal eye be fatter to look at near objects and thinner to look at distant objects?
The muscles around the lens of your eye push and pull it thicker and thinner to focus your eye on an object depending on the distance from your eye to the object. The focal length of a fat lens is shorter than the focal length of a thin lens (the light rays are bent more sharply) When you focus binoculars, you are adjusting their focal length
How the lens change it shape when foucsing on near objects?
the lens of our eyes is different to the lens of a magnifying glass-it can change its shape from thick to thin
Why do convex lenses have shorter focal lengths than thin convex lenses?
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.
How does a concave len look?
a concave lens is thin in the middle, but thick on the sides. It does this: it makes what you look at bigger because it spreads out light
How does a concave lens correct nearsightedness?
The eye lens may become too thick & its focal length is reduced. the ciliary muscles are not able to relax sufficiently to make the eye lens thin when viewing distant objects. So, they are unable to increase the focal length of the lens & the image is formed before retina. Since short sightedness occurs due to excessive convergence of light rays by the eye lens, it can be corrected by using a diverging lens, i.e, a concave lens. A properly chosen focal length of a concave lens compensates the extra convergence of the eye lens thus, removing the defect. The scientific name of short sightedness is myopia.
What lens is thick in the middle and thin at the edge?
convex lens
Which lens is THIN in the middle and thiCK At the edges?
A convex lens.
What is the difference between a thick convex lens and a thin convex lens?
In optics, a thin lens is a lens with a thickness (distance along the optical axis between the two surfaces of the lens) that is negligible compared to the focal length of the lens. Lenses whose thickness is not negligible are sometimes called thick lenses.
Whats the difference between thick and thin lens?
The diffrence between thick and thin lens depends on your precription for your eyes.
What is the optical center of a zoom lens?
If you look through the lens at a distant point, the point image will not move when the lens is rotated slightly about a vertical or horizontal axis the goes through the nodal point. This is called the optical center. With a thin lens this is close to the geometric center, with a longer complex lens the optical center is buried somewhere inside. The optcial center of a complex lens may or may not be inside an element.
What is the thin transparent matter that covers the lens?
Retina
A lens that is thick in the middle and thin on the edges is a?
oncave
