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- FOCAL PLANE
A plane perpendicular to the axis of an optical system and passing through the focal poit of the system
- FOCAL POINT
A point of convergence and divergnce of light and other radiations
Wiki User
∙ 14y ago
Wiki User
∙ 14y agoIt is the place where, if we mounted film or an electronic detector, we could get a clear (not blurry) image of an object viewed through the telescope.
Wiki User
∙ 12y agoThe focal point or principal focus of a lens is where rays meet after reflection or refraction
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∙ 11y agoThe Center of curvature for the two sides of the lens and the properties of the material it is made from. Apex
Wiki User
∙ 12y agoThe point in the lens through which when light passes, it will go undeviated. Such a point is known as centre or optic centre of the lens. Denoted usually by the letter C.
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Point at which light rays are converged by a convex lens?
Focus (only at the focal point if the incoming rays are all parallel to the axis).
What is secondary focal leangth?
By definition: "The secondary focal point is where rays that are parallel when they enter the lens cross or appear to have crossed."
What happens to light that passes through a convex lens?
Light travelling through a concave lens will spread out. In most optical systems that use a concave lens, such as a telescope that needs to magnify the focal plane image, this is a desirable effect.
Do near objects have a longer focal length?
Focal length is related to the lens. It has nothing to do with how near or far the object is to the lens or objective.
What units are Lens focal lengths are measured in?
Focal length is measured in milimeters (mm) -----------------------------------------------------------------
What is defined as the distance between a lens and its focal point?
focal length of the lens
Difference between focal point and focal length?
The focal point is the point where light converges after it passes through a concave lens. The focal length is the distance of the focal point to the lens. Same for a convex lens, except that the focal point is the imaginary point from where light deflected from lens seems to have emerged.
What is the focal length of the convex lens?
The distance from the centre of the lens to the focal point.
What kind of lens has a focal point?
Convex lenses have a focal point.
Where is the focal point in a convex lens?
If you shine a parallel (ie unfocussed) beam of light perpendicular to a convex lens it will focus to a point on the other side. That place is called the focal point of the lens. Its distance to the lens is called the focal length.
What are two ways to focus a hand lens?
by either moving the object understudy to the focal point of the lens or to move the lens until the object is at the focal point.
The focal point of a lens depends on which two things?
Radius of curvature and refractive index of the material
Use the word length in a sentence?
Focal Point:The distance from the Lens to the Focal Point is called the Focal Point.
The distance from lens to focal point is called?
It is called the focal length.
Why does the focal length of a mirror not depend on the mirror material when the focal length of a lens does depend on the lens material?
The focal length for a mirror is determined by the law of reflection from the mirror surface. This law is not governed by the material that the mirror is made by. This means that the focal length depends only on the radius and curvature. Conversely, the focal length of a lens depends on the indices of refraction of the lens meterial and the surrounding medium.
What is the distance between a lens and its focal point is called?
This is called focal length.
Why is convex lens used for myopia?
Convex lenses cause the focal point to appear behind the lens (positive convergence). In myopia, the focal point lies somewhere between the lens and the retina, it needs to converge at a point farther than it is converging, this is why a convex lens is used, to push the focal point back so it will hit the retina. A concave lens would do the opposite for hyperopia (the focal point appears behind the retina), it will adjust the focal point to lie more anteriorly and land on the retina.
