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A "normal" concave lens might have a focal length anywhere between a few mm and a couple of metres. Outside that range there is nothing particularly abnormal, perhaps just less common.
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∙ 11y ago
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How can a rough value of the focal length of a concave mirror be obtained?
rough focal length of concave mirror
Focal length of a concave mirror?
1/object distance + 1/ image distance = 1/focal length
What is the relation between focal length and center of curvature?
The focal length of a concave mirror is about equal to half of its radius of curvature.
Why do images in a concave mirror appear inverted?
If an object's distance from the concave mirror is greater than the mirror's focal length, then the mirror image of it will be inverted. If the distance from the concave mirror is less than the focal length of the mirror, the image will not be inverted. No image will be produced if the distance from the mirror to the object is equal to the mirror's focal length.
Length of a lens is the distance from the center of the lens to its principal focus?
It is called the focal length. It is equal to 1/2 times r, and is positive on concave mirrors and negative on convex mirrors.
What is the focal length of concave mirror to form real image?
15cm
Will focal length of concave mirror change when kept in water?
yes
A concave lens is kept in contact with convex lens of focal length 20cm the combination works as a converging lens of focal length 100cmcalculate the power of concave lens?
i think it is -0.06m i.e. 6cm
What is the positive lens is the same as?
The focal point F and focal length f of a positive (convex) lens, a negative (concave) lens, a concave mirror, and a convex mirror. The focal length of an optical system is a measure of how strongly the system converges or diverges light.
For very small angles the focal length of a concave mirror is?
Half of the radius
What is the medical application of the focal length of concave lens?
medical application of lens
Why is concave lens called a negative lens?
Concave lens is called a negative lens because it has a negative focal length.
